From 1111aa9bf286072db3cee3f40bca4a841befd060 Mon Sep 17 00:00:00 2001
From: Graham Dixon <graham@gdixon.co.uk>
Date: Fri, 5 Feb 2021 15:32:06 +0000
Subject: [PATCH] Updates bootstrap v4.3.1 -> v4.6.0

---
 app/assets/v3/scss/lib/bootstrap/_alert.scss  |  1 +
 app/assets/v3/scss/lib/bootstrap/_badge.scss  |  2 +-
 .../v3/scss/lib/bootstrap/_breadcrumb.scss    |  5 +-
 .../v3/scss/lib/bootstrap/_button-group.scss  |  2 +-
 .../v3/scss/lib/bootstrap/_buttons.scss       | 21 +++--
 app/assets/v3/scss/lib/bootstrap/_card.scss   | 87 +++++++++--------
 .../v3/scss/lib/bootstrap/_carousel.scss      | 14 +--
 app/assets/v3/scss/lib/bootstrap/_close.scss  |  5 +-
 app/assets/v3/scss/lib/bootstrap/_code.scss   |  2 +-
 .../v3/scss/lib/bootstrap/_custom-forms.scss  | 57 ++++++++----
 .../v3/scss/lib/bootstrap/_dropdown.scss      | 13 +--
 app/assets/v3/scss/lib/bootstrap/_forms.scss  | 35 +++++--
 .../v3/scss/lib/bootstrap/_functions.scss     | 68 +++++++++++++-
 app/assets/v3/scss/lib/bootstrap/_grid.scss   | 43 ++++++---
 app/assets/v3/scss/lib/bootstrap/_images.scss |  4 +-
 .../v3/scss/lib/bootstrap/_input-group.scss   | 27 ++++--
 .../v3/scss/lib/bootstrap/_list-group.scss    | 67 ++++++-------
 app/assets/v3/scss/lib/bootstrap/_mixins.scss |  6 +-
 app/assets/v3/scss/lib/bootstrap/_modal.scss  | 41 +++++---
 app/assets/v3/scss/lib/bootstrap/_nav.scss    | 14 +--
 app/assets/v3/scss/lib/bootstrap/_navbar.scss | 72 ++++++++++----
 .../v3/scss/lib/bootstrap/_pagination.scss    |  9 +-
 .../v3/scss/lib/bootstrap/_popover.scss       | 17 ++--
 app/assets/v3/scss/lib/bootstrap/_print.scss  |  4 +-
 .../v3/scss/lib/bootstrap/_progress.scss      | 10 +-
 app/assets/v3/scss/lib/bootstrap/_reboot.scss | 77 +++++++--------
 .../v3/scss/lib/bootstrap/_spinners.scss      | 18 +++-
 app/assets/v3/scss/lib/bootstrap/_tables.scss |  6 +-
 app/assets/v3/scss/lib/bootstrap/_toasts.scss |  6 +-
 app/assets/v3/scss/lib/bootstrap/_type.scss   |  6 +-
 .../v3/scss/lib/bootstrap/_utilities.scss     |  3 +-
 .../v3/scss/lib/bootstrap/_variables.scss     | 93 ++++++++++++-------
 .../v3/scss/lib/bootstrap/bootstrap-grid.scss |  9 +-
 .../scss/lib/bootstrap/bootstrap-reboot.scss  |  8 +-
 .../v3/scss/lib/bootstrap/bootstrap.scss      |  8 +-
 .../bootstrap/mixins/_background-variant.scss |  8 +-
 .../v3/scss/lib/bootstrap/mixins/_badge.scss  |  2 +-
 .../lib/bootstrap/mixins/_border-radius.scss  | 41 +++++---
 .../scss/lib/bootstrap/mixins/_buttons.scss   | 19 ++--
 .../v3/scss/lib/bootstrap/mixins/_caret.scss  | 16 ++--
 .../v3/scss/lib/bootstrap/mixins/_float.scss  |  6 +-
 .../v3/scss/lib/bootstrap/mixins/_forms.scss  | 91 +++++++++---------
 .../lib/bootstrap/mixins/_grid-framework.scss | 44 ++++++---
 .../v3/scss/lib/bootstrap/mixins/_grid.scss   | 32 +++++--
 .../v3/scss/lib/bootstrap/mixins/_hover.scss  |  8 +-
 .../v3/scss/lib/bootstrap/mixins/_image.scss  |  4 +-
 .../lib/bootstrap/mixins/_list-group.scss     |  2 +-
 .../v3/scss/lib/bootstrap/mixins/_lists.scss  |  2 +-
 .../lib/bootstrap/mixins/_nav-divider.scss    |  3 +-
 .../lib/bootstrap/mixins/_reset-text.scss     |  2 +-
 .../lib/bootstrap/mixins/_screen-reader.scss  |  7 +-
 .../scss/lib/bootstrap/mixins/_table-row.scss |  2 +-
 .../lib/bootstrap/mixins/_text-emphasis.scss  |  5 +-
 .../lib/bootstrap/mixins/_transition.scss     | 26 ++++--
 .../lib/bootstrap/utilities/_background.scss  |  4 +-
 .../lib/bootstrap/utilities/_borders.scss     |  2 +-
 .../bootstrap/utilities/_interactions.scss    |  5 +
 .../scss/lib/bootstrap/utilities/_text.scss   |  8 +-
 58 files changed, 745 insertions(+), 454 deletions(-)
 create mode 100644 app/assets/v3/scss/lib/bootstrap/utilities/_interactions.scss

diff --git a/app/assets/v3/scss/lib/bootstrap/_alert.scss b/app/assets/v3/scss/lib/bootstrap/_alert.scss
index da2a98af94e..4aa1fc20397 100644
--- a/app/assets/v3/scss/lib/bootstrap/_alert.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_alert.scss
@@ -34,6 +34,7 @@
     position: absolute;
     top: 0;
     right: 0;
+    z-index: 2;
     padding: $alert-padding-y $alert-padding-x;
     color: inherit;
   }
diff --git a/app/assets/v3/scss/lib/bootstrap/_badge.scss b/app/assets/v3/scss/lib/bootstrap/_badge.scss
index 2082f058ece..42c5d08d748 100644
--- a/app/assets/v3/scss/lib/bootstrap/_badge.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_badge.scss
@@ -16,7 +16,7 @@
   @include transition($badge-transition);
 
   @at-root a#{&} {
-    @include hover-focus {
+    @include hover-focus() {
       text-decoration: none;
     }
   }
diff --git a/app/assets/v3/scss/lib/bootstrap/_breadcrumb.scss b/app/assets/v3/scss/lib/bootstrap/_breadcrumb.scss
index be309506903..9c204c7d553 100644
--- a/app/assets/v3/scss/lib/bootstrap/_breadcrumb.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_breadcrumb.scss
@@ -3,6 +3,7 @@
   flex-wrap: wrap;
   padding: $breadcrumb-padding-y $breadcrumb-padding-x;
   margin-bottom: $breadcrumb-margin-bottom;
+  @include font-size($breadcrumb-font-size);
   list-style: none;
   background-color: $breadcrumb-bg;
   @include border-radius($breadcrumb-border-radius);
@@ -14,10 +15,10 @@
     padding-left: $breadcrumb-item-padding;
 
     &::before {
-      display: inline-block; // Suppress underlining of the separator in modern browsers
+      float: left; // Suppress inline spacings and underlining of the separator
       padding-right: $breadcrumb-item-padding;
       color: $breadcrumb-divider-color;
-      content: $breadcrumb-divider;
+      content: escape-svg($breadcrumb-divider);
     }
   }
 
diff --git a/app/assets/v3/scss/lib/bootstrap/_button-group.scss b/app/assets/v3/scss/lib/bootstrap/_button-group.scss
index d7220029ad1..da02d7931b6 100644
--- a/app/assets/v3/scss/lib/bootstrap/_button-group.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_button-group.scss
@@ -13,7 +13,7 @@
 
     // Bring the hover, focused, and "active" buttons to the front to overlay
     // the borders properly
-    @include hover {
+    @include hover() {
       z-index: 1;
     }
     &:focus,
diff --git a/app/assets/v3/scss/lib/bootstrap/_buttons.scss b/app/assets/v3/scss/lib/bootstrap/_buttons.scss
index 2a7d94ad228..6ee24ba1fcf 100644
--- a/app/assets/v3/scss/lib/bootstrap/_buttons.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_buttons.scss
@@ -10,6 +10,8 @@
   font-weight: $btn-font-weight;
   color: $body-color;
   text-align: center;
+  text-decoration: if($link-decoration == none, null, none);
+  white-space: $btn-white-space;
   vertical-align: middle;
   user-select: none;
   background-color: transparent;
@@ -17,7 +19,7 @@
   @include button-size($btn-padding-y, $btn-padding-x, $btn-font-size, $btn-line-height, $btn-border-radius);
   @include transition($btn-transition);
 
-  @include hover {
+  @include hover() {
     color: $body-color;
     text-decoration: none;
   }
@@ -35,12 +37,16 @@
     @include box-shadow(none);
   }
 
-  &:not(:disabled):not(.disabled):active,
-  &:not(:disabled):not(.disabled).active {
-    @include box-shadow($btn-active-box-shadow);
+  &:not(:disabled):not(.disabled) {
+    cursor: if($enable-pointer-cursor-for-buttons, pointer, null);
 
-    &:focus {
-      @include box-shadow($btn-focus-box-shadow, $btn-active-box-shadow);
+    &:active,
+    &.active {
+      @include box-shadow($btn-active-box-shadow);
+
+      &:focus {
+        @include box-shadow($btn-focus-box-shadow, $btn-active-box-shadow);
+      }
     }
   }
 }
@@ -79,7 +85,7 @@ fieldset:disabled a.btn {
   color: $link-color;
   text-decoration: $link-decoration;
 
-  @include hover {
+  @include hover() {
     color: $link-hover-color;
     text-decoration: $link-hover-decoration;
   }
@@ -87,7 +93,6 @@ fieldset:disabled a.btn {
   &:focus,
   &.focus {
     text-decoration: $link-hover-decoration;
-    box-shadow: none;
   }
 
   &:disabled,
diff --git a/app/assets/v3/scss/lib/bootstrap/_card.scss b/app/assets/v3/scss/lib/bootstrap/_card.scss
index c6b67ce05d5..faaa75ef7fc 100644
--- a/app/assets/v3/scss/lib/bootstrap/_card.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_card.scss
@@ -7,6 +7,7 @@
   display: flex;
   flex-direction: column;
   min-width: 0; // See https://github.com/twbs/bootstrap/pull/22740#issuecomment-305868106
+  height: $card-height;
   word-wrap: break-word;
   background-color: $card-bg;
   background-clip: border-box;
@@ -18,23 +19,36 @@
     margin-left: 0;
   }
 
-  > .list-group:first-child {
-    .list-group-item:first-child {
-      @include border-top-radius($card-border-radius);
+  > .list-group {
+    border-top: inherit;
+    border-bottom: inherit;
+
+    &:first-child {
+      border-top-width: 0;
+      @include border-top-radius($card-inner-border-radius);
     }
-  }
 
-  > .list-group:last-child {
-    .list-group-item:last-child {
-      @include border-bottom-radius($card-border-radius);
+    &:last-child  {
+      border-bottom-width: 0;
+      @include border-bottom-radius($card-inner-border-radius);
     }
   }
+
+  // Due to specificity of the above selector (`.card > .list-group`), we must
+  // use a child selector here to prevent double borders.
+  > .card-header + .list-group,
+  > .list-group + .card-footer {
+    border-top: 0;
+  }
 }
 
 .card-body {
   // Enable `flex-grow: 1` for decks and groups so that card blocks take up
   // as much space as possible, ensuring footers are aligned to the bottom.
   flex: 1 1 auto;
+  // Workaround for the image size bug in IE
+  // See: https://github.com/twbs/bootstrap/pull/28855
+  min-height: 1px;
   padding: $card-spacer-x;
   color: $card-color;
 }
@@ -53,7 +67,7 @@
 }
 
 .card-link {
-  @include hover {
+  @include hover() {
     text-decoration: none;
   }
 
@@ -76,16 +90,11 @@
   &:first-child {
     @include border-radius($card-inner-border-radius $card-inner-border-radius 0 0);
   }
-
-  + .list-group {
-    .list-group-item:first-child {
-      border-top: 0;
-    }
-  }
 }
 
 .card-footer {
   padding: $card-spacer-y $card-spacer-x;
+  color: $card-cap-color;
   background-color: $card-cap-bg;
   border-top: $card-border-width solid $card-border-color;
 
@@ -119,21 +128,23 @@
   bottom: 0;
   left: 0;
   padding: $card-img-overlay-padding;
+  @include border-radius($card-inner-border-radius);
 }
 
-.card-img {
+.card-img,
+.card-img-top,
+.card-img-bottom {
+  flex-shrink: 0; // For IE: https://github.com/twbs/bootstrap/issues/29396
   width: 100%; // Required because we use flexbox and this inherently applies align-self: stretch
-  @include border-radius($card-inner-border-radius);
 }
 
-// Card image caps
+.card-img,
 .card-img-top {
-  width: 100%; // Required because we use flexbox and this inherently applies align-self: stretch
   @include border-top-radius($card-inner-border-radius);
 }
 
+.card-img,
 .card-img-bottom {
-  width: 100%; // Required because we use flexbox and this inherently applies align-self: stretch
   @include border-bottom-radius($card-inner-border-radius);
 }
 
@@ -141,23 +152,19 @@
 // Card deck
 
 .card-deck {
-  display: flex;
-  flex-direction: column;
-
   .card {
     margin-bottom: $card-deck-margin;
   }
 
   @include media-breakpoint-up(sm) {
+    display: flex;
     flex-flow: row wrap;
     margin-right: -$card-deck-margin;
     margin-left: -$card-deck-margin;
 
     .card {
-      display: flex;
       // Flexbugs #4: https://github.com/philipwalton/flexbugs#flexbug-4
       flex: 1 0 0%;
-      flex-direction: column;
       margin-right: $card-deck-margin;
       margin-bottom: 0; // Override the default
       margin-left: $card-deck-margin;
@@ -171,9 +178,6 @@
 //
 
 .card-group {
-  display: flex;
-  flex-direction: column;
-
   // The child selector allows nested `.card` within `.card-group`
   // to display properly.
   > .card {
@@ -181,6 +185,7 @@
   }
 
   @include media-breakpoint-up(sm) {
+    display: flex;
     flex-flow: row wrap;
     // The child selector allows nested `.card` within `.card-group`
     // to display properly.
@@ -201,12 +206,12 @@
 
           .card-img-top,
           .card-header {
-            // stylelint-disable-next-line property-blacklist
+            // stylelint-disable-next-line property-disallowed-list
             border-top-right-radius: 0;
           }
           .card-img-bottom,
           .card-footer {
-            // stylelint-disable-next-line property-blacklist
+            // stylelint-disable-next-line property-disallowed-list
             border-bottom-right-radius: 0;
           }
         }
@@ -216,12 +221,12 @@
 
           .card-img-top,
           .card-header {
-            // stylelint-disable-next-line property-blacklist
+            // stylelint-disable-next-line property-disallowed-list
             border-top-left-radius: 0;
           }
           .card-img-bottom,
           .card-footer {
-            // stylelint-disable-next-line property-blacklist
+            // stylelint-disable-next-line property-disallowed-list
             border-bottom-left-radius: 0;
           }
         }
@@ -259,30 +264,22 @@
 //
 
 .accordion {
+  overflow-anchor: none;
+
   > .card {
     overflow: hidden;
 
-    &:not(:first-of-type) {
-      .card-header:first-child {
-        @include border-radius(0);
-      }
-
-      &:not(:last-of-type) {
-        border-bottom: 0;
-        @include border-radius(0);
-      }
-    }
-
-    &:first-of-type {
+    &:not(:last-of-type) {
       border-bottom: 0;
       @include border-bottom-radius(0);
     }
 
-    &:last-of-type {
+    &:not(:first-of-type) {
       @include border-top-radius(0);
     }
 
-    .card-header {
+    > .card-header {
+      @include border-radius(0);
       margin-bottom: -$card-border-width;
     }
   }
diff --git a/app/assets/v3/scss/lib/bootstrap/_carousel.scss b/app/assets/v3/scss/lib/bootstrap/_carousel.scss
index 20ea04baf4e..db30bed8b9e 100644
--- a/app/assets/v3/scss/lib/bootstrap/_carousel.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_carousel.scss
@@ -75,7 +75,7 @@
   .active.carousel-item-right {
     z-index: 0;
     opacity: 0;
-    @include transition(0s $carousel-transition-duration opacity);
+    @include transition(opacity 0s $carousel-transition-duration);
   }
 }
 
@@ -101,7 +101,7 @@
   @include transition($carousel-control-transition);
 
   // Hover/focus state
-  @include hover-focus {
+  @include hover-focus() {
     color: $carousel-control-color;
     text-decoration: none;
     outline: 0;
@@ -111,13 +111,13 @@
 .carousel-control-prev {
   left: 0;
   @if $enable-gradients {
-    background: linear-gradient(90deg, rgba($black, .25), rgba($black, .001));
+    background-image: linear-gradient(90deg, rgba($black, .25), rgba($black, .001));
   }
 }
 .carousel-control-next {
   right: 0;
   @if $enable-gradients {
-    background: linear-gradient(270deg, rgba($black, .25), rgba($black, .001));
+    background-image: linear-gradient(270deg, rgba($black, .25), rgba($black, .001));
   }
 }
 
@@ -127,13 +127,13 @@
   display: inline-block;
   width: $carousel-control-icon-width;
   height: $carousel-control-icon-width;
-  background: no-repeat 50% / 100% 100%;
+  background: 50% / 100% 100% no-repeat;
 }
 .carousel-control-prev-icon {
-  background-image: $carousel-control-prev-icon-bg;
+  background-image: escape-svg($carousel-control-prev-icon-bg);
 }
 .carousel-control-next-icon {
-  background-image: $carousel-control-next-icon-bg;
+  background-image: escape-svg($carousel-control-next-icon-bg);
 }
 
 
diff --git a/app/assets/v3/scss/lib/bootstrap/_close.scss b/app/assets/v3/scss/lib/bootstrap/_close.scss
index 5cc96f573e1..82e9593ef14 100644
--- a/app/assets/v3/scss/lib/bootstrap/_close.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_close.scss
@@ -8,13 +8,13 @@
   opacity: .5;
 
   // Override <a>'s hover style
-  @include hover {
+  @include hover() {
     color: $close-color;
     text-decoration: none;
   }
 
   &:not(:disabled):not(.disabled) {
-    @include hover-focus {
+    @include hover-focus() {
       opacity: .75;
     }
   }
@@ -30,7 +30,6 @@ button.close {
   padding: 0;
   background-color: transparent;
   border: 0;
-  appearance: none;
 }
 
 // Future-proof disabling of clicks on `<a>` elements
diff --git a/app/assets/v3/scss/lib/bootstrap/_code.scss b/app/assets/v3/scss/lib/bootstrap/_code.scss
index 74b6e1c89be..4bc117a96de 100644
--- a/app/assets/v3/scss/lib/bootstrap/_code.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_code.scss
@@ -2,7 +2,7 @@
 code {
   @include font-size($code-font-size);
   color: $code-color;
-  word-break: break-word;
+  word-wrap: break-word;
 
   // Streamline the style when inside anchors to avoid broken underline and more
   a > & {
diff --git a/app/assets/v3/scss/lib/bootstrap/_custom-forms.scss b/app/assets/v3/scss/lib/bootstrap/_custom-forms.scss
index 03f3fc5be2d..06725ff3644 100644
--- a/app/assets/v3/scss/lib/bootstrap/_custom-forms.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_custom-forms.scss
@@ -9,9 +9,11 @@
 
 .custom-control {
   position: relative;
+  z-index: 1;
   display: block;
   min-height: $font-size-base * $line-height-base;
   padding-left: $custom-control-gutter + $custom-control-indicator-size;
+  color-adjust: exact; // Keep themed appearance for print
 }
 
 .custom-control-inline {
@@ -21,7 +23,10 @@
 
 .custom-control-input {
   position: absolute;
+  left: 0;
   z-index: -1; // Put the input behind the label so it doesn't overlay text
+  width: $custom-control-indicator-size;
+  height: ($font-size-base * $line-height-base + $custom-control-indicator-size) / 2;
   opacity: 0;
 
   &:checked ~ .custom-control-label::before {
@@ -34,7 +39,7 @@
   &:focus ~ .custom-control-label::before {
     // the mixin is not used here to make sure there is feedback
     @if $enable-shadows {
-      box-shadow: $input-box-shadow, $input-focus-box-shadow;
+      box-shadow: $input-box-shadow, $custom-control-indicator-focus-box-shadow;
     } @else {
       box-shadow: $custom-control-indicator-focus-box-shadow;
     }
@@ -51,6 +56,8 @@
     @include box-shadow($custom-control-indicator-active-box-shadow);
   }
 
+  // Use [disabled] and :disabled to work around https://github.com/twbs/bootstrap/issues/28247
+  &[disabled],
   &:disabled {
     ~ .custom-control-label {
       color: $custom-control-label-disabled-color;
@@ -69,7 +76,9 @@
 .custom-control-label {
   position: relative;
   margin-bottom: 0;
+  color: $custom-control-label-color;
   vertical-align: top;
+  cursor: $custom-control-cursor;
 
   // Background-color and (when enabled) gradient
   &::before {
@@ -95,7 +104,7 @@
     width: $custom-control-indicator-size;
     height: $custom-control-indicator-size;
     content: "";
-    background: no-repeat 50% / #{$custom-control-indicator-bg-size};
+    background: 50% / #{$custom-control-indicator-bg-size} no-repeat;
   }
 }
 
@@ -111,7 +120,7 @@
 
   .custom-control-input:checked ~ .custom-control-label {
     &::after {
-      background-image: $custom-checkbox-indicator-icon-checked;
+      background-image: escape-svg($custom-checkbox-indicator-icon-checked);
     }
   }
 
@@ -122,16 +131,16 @@
       @include box-shadow($custom-checkbox-indicator-indeterminate-box-shadow);
     }
     &::after {
-      background-image: $custom-checkbox-indicator-icon-indeterminate;
+      background-image: escape-svg($custom-checkbox-indicator-icon-indeterminate);
     }
   }
 
   .custom-control-input:disabled {
     &:checked ~ .custom-control-label::before {
-      background-color: $custom-control-indicator-checked-disabled-bg;
+      @include gradient-bg($custom-control-indicator-checked-disabled-bg);
     }
     &:indeterminate ~ .custom-control-label::before {
-      background-color: $custom-control-indicator-checked-disabled-bg;
+      @include gradient-bg($custom-control-indicator-checked-disabled-bg);
     }
   }
 }
@@ -142,19 +151,19 @@
 
 .custom-radio {
   .custom-control-label::before {
-    // stylelint-disable-next-line property-blacklist
+    // stylelint-disable-next-line property-disallowed-list
     border-radius: $custom-radio-indicator-border-radius;
   }
 
   .custom-control-input:checked ~ .custom-control-label {
     &::after {
-      background-image: $custom-radio-indicator-icon-checked;
+      background-image: escape-svg($custom-radio-indicator-icon-checked);
     }
   }
 
   .custom-control-input:disabled {
     &:checked ~ .custom-control-label::before {
-      background-color: $custom-control-indicator-checked-disabled-bg;
+      @include gradient-bg($custom-control-indicator-checked-disabled-bg);
     }
   }
 }
@@ -172,17 +181,17 @@
       left: -($custom-switch-width + $custom-control-gutter);
       width: $custom-switch-width;
       pointer-events: all;
-      // stylelint-disable-next-line property-blacklist
+      // stylelint-disable-next-line property-disallowed-list
       border-radius: $custom-switch-indicator-border-radius;
     }
 
     &::after {
-      top: calc(#{(($font-size-base * $line-height-base - $custom-control-indicator-size) / 2)} + #{$custom-control-indicator-border-width * 2});
-      left: calc(#{-($custom-switch-width + $custom-control-gutter)} + #{$custom-control-indicator-border-width * 2});
+      top: add(($font-size-base * $line-height-base - $custom-control-indicator-size) / 2, $custom-control-indicator-border-width * 2);
+      left: add(-($custom-switch-width + $custom-control-gutter), $custom-control-indicator-border-width * 2);
       width: $custom-switch-indicator-size;
       height: $custom-switch-indicator-size;
       background-color: $custom-control-indicator-border-color;
-      // stylelint-disable-next-line property-blacklist
+      // stylelint-disable-next-line property-disallowed-list
       border-radius: $custom-switch-indicator-border-radius;
       @include transition(transform .15s ease-in-out, $custom-forms-transition);
     }
@@ -197,7 +206,7 @@
 
   .custom-control-input:disabled {
     &:checked ~ .custom-control-label::before {
-      background-color: $custom-control-indicator-checked-disabled-bg;
+      @include gradient-bg($custom-control-indicator-checked-disabled-bg);
     }
   }
 }
@@ -220,8 +229,7 @@
   line-height: $custom-select-line-height;
   color: $custom-select-color;
   vertical-align: middle;
-  background: $custom-select-background;
-  background-color: $custom-select-bg;
+  background: $custom-select-bg $custom-select-background;
   border: $custom-select-border-width solid $custom-select-border-color;
   @include border-radius($custom-select-border-radius, 0);
   @include box-shadow($custom-select-box-shadow);
@@ -231,8 +239,9 @@
     border-color: $custom-select-focus-border-color;
     outline: 0;
     @if $enable-shadows {
-      box-shadow: $custom-select-box-shadow, $custom-select-focus-box-shadow;
+      @include box-shadow($custom-select-box-shadow, $custom-select-focus-box-shadow);
     } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
       box-shadow: $custom-select-focus-box-shadow;
     }
 
@@ -263,6 +272,12 @@
   &::-ms-expand {
     display: none;
   }
+
+  // Remove outline from select box in FF
+  &:-moz-focusring {
+    color: transparent;
+    text-shadow: 0 0 0 $custom-select-color;
+  }
 }
 
 .custom-select-sm {
@@ -300,6 +315,7 @@
   width: 100%;
   height: $custom-file-height;
   margin: 0;
+  overflow: hidden;
   opacity: 0;
 
   &:focus ~ .custom-file-label {
@@ -307,6 +323,8 @@
     box-shadow: $custom-file-focus-box-shadow;
   }
 
+  // Use [disabled] and :disabled to work around https://github.com/twbs/bootstrap/issues/28247
+  &[disabled] ~ .custom-file-label,
   &:disabled ~ .custom-file-label {
     background-color: $custom-file-disabled-bg;
   }
@@ -330,6 +348,7 @@
   z-index: 1;
   height: $custom-file-height;
   padding: $custom-file-padding-y $custom-file-padding-x;
+  overflow: hidden;
   font-family: $custom-file-font-family;
   font-weight: $custom-file-font-weight;
   line-height: $custom-file-line-height;
@@ -365,13 +384,13 @@
 
 .custom-range {
   width: 100%;
-  height: calc(#{$custom-range-thumb-height} + #{$custom-range-thumb-focus-box-shadow-width * 2});
+  height: add($custom-range-thumb-height, $custom-range-thumb-focus-box-shadow-width * 2);
   padding: 0; // Need to reset padding
   background-color: transparent;
   appearance: none;
 
   &:focus {
-    outline: none;
+    outline: 0;
 
     // Pseudo-elements must be split across multiple rulesets to have an effect.
     // No box-shadow() mixin for focus accessibility.
diff --git a/app/assets/v3/scss/lib/bootstrap/_dropdown.scss b/app/assets/v3/scss/lib/bootstrap/_dropdown.scss
index ac3c8c8a2c5..f39de118576 100644
--- a/app/assets/v3/scss/lib/bootstrap/_dropdown.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_dropdown.scss
@@ -10,7 +10,7 @@
   white-space: nowrap;
 
   // Generate the caret automatically
-  @include caret;
+  @include caret();
 }
 
 // The dropdown menu
@@ -22,7 +22,7 @@
   display: none; // none by default, but block on "open" of the menu
   float: left;
   min-width: $dropdown-min-width;
-  padding: $dropdown-padding-y 0;
+  padding: $dropdown-padding-y $dropdown-padding-x;
   margin: $dropdown-spacer 0 0; // override default ul
   @include font-size($dropdown-font-size);
   color: $dropdown-color;
@@ -100,7 +100,7 @@
   }
 }
 
-// When enabled Popper.js, reset basic dropdown position
+// When Popper is enabled, reset the basic dropdown position
 // stylelint-disable-next-line no-duplicate-selectors
 .dropdown-menu {
   &[x-placement^="top"],
@@ -114,7 +114,7 @@
 
 // Dividers (basically an `<hr>`) within the dropdown
 .dropdown-divider {
-  @include nav-divider($dropdown-divider-bg, $dropdown-divider-margin-y);
+  @include nav-divider($dropdown-divider-bg, $dropdown-divider-margin-y, true);
 }
 
 // Links, buttons, and more within the dropdown menu
@@ -128,6 +128,7 @@
   font-weight: $font-weight-normal;
   color: $dropdown-link-color;
   text-align: inherit; // For `<button>`s
+  text-decoration: if($link-decoration == none, null, none);
   white-space: nowrap; // prevent links from randomly breaking onto new lines
   background-color: transparent; // For `<button>`s
   border: 0; // For `<button>`s
@@ -144,7 +145,7 @@
     }
   }
 
-  @include hover-focus {
+  @include hover-focus() {
     color: $dropdown-link-hover-color;
     text-decoration: none;
     @include gradient-bg($dropdown-link-hover-bg);
@@ -176,7 +177,7 @@
 // Dropdown section headers
 .dropdown-header {
   display: block;
-  padding: $dropdown-padding-y $dropdown-item-padding-x;
+  padding: $dropdown-header-padding;
   margin-bottom: 0; // for use with heading elements
   @include font-size($font-size-sm);
   color: $dropdown-header-color;
diff --git a/app/assets/v3/scss/lib/bootstrap/_forms.scss b/app/assets/v3/scss/lib/bootstrap/_forms.scss
index ec9c335591b..66a4efe1d47 100644
--- a/app/assets/v3/scss/lib/bootstrap/_forms.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_forms.scss
@@ -30,8 +30,14 @@
     border: 0;
   }
 
+  // Remove select outline from select box in FF
+  &:-moz-focusring {
+    color: transparent;
+    text-shadow: 0 0 0 $input-color;
+  }
+
   // Customize the `:focus` state to imitate native WebKit styles.
-  @include form-control-focus();
+  @include form-control-focus($ignore-warning: true);
 
   // Placeholder
   &::placeholder {
@@ -53,6 +59,15 @@
   }
 }
 
+input[type="date"],
+input[type="time"],
+input[type="datetime-local"],
+input[type="month"] {
+  &.form-control {
+    appearance: none; // Fix appearance for date inputs in Safari
+  }
+}
+
 select.form-control {
   &:focus::-ms-value {
     // Suppress the nested default white text on blue background highlight given to
@@ -80,23 +95,23 @@ select.form-control {
 // For use with horizontal and inline forms, when you need the label (or legend)
 // text to align with the form controls.
 .col-form-label {
-  padding-top: calc(#{$input-padding-y} + #{$input-border-width});
-  padding-bottom: calc(#{$input-padding-y} + #{$input-border-width});
+  padding-top: add($input-padding-y, $input-border-width);
+  padding-bottom: add($input-padding-y, $input-border-width);
   margin-bottom: 0; // Override the `<label>/<legend>` default
   @include font-size(inherit); // Override the `<legend>` default
   line-height: $input-line-height;
 }
 
 .col-form-label-lg {
-  padding-top: calc(#{$input-padding-y-lg} + #{$input-border-width});
-  padding-bottom: calc(#{$input-padding-y-lg} + #{$input-border-width});
+  padding-top: add($input-padding-y-lg, $input-border-width);
+  padding-bottom: add($input-padding-y-lg, $input-border-width);
   @include font-size($input-font-size-lg);
   line-height: $input-line-height-lg;
 }
 
 .col-form-label-sm {
-  padding-top: calc(#{$input-padding-y-sm} + #{$input-border-width});
-  padding-bottom: calc(#{$input-padding-y-sm} + #{$input-border-width});
+  padding-top: add($input-padding-y-sm, $input-border-width);
+  padding-bottom: add($input-padding-y-sm, $input-border-width);
   @include font-size($input-font-size-sm);
   line-height: $input-line-height-sm;
 }
@@ -110,9 +125,9 @@ select.form-control {
 .form-control-plaintext {
   display: block;
   width: 100%;
-  padding-top: $input-padding-y;
-  padding-bottom: $input-padding-y;
+  padding: $input-padding-y 0;
   margin-bottom: 0; // match inputs if this class comes on inputs with default margins
+  @include font-size($input-font-size);
   line-height: $input-line-height;
   color: $input-plaintext-color;
   background-color: transparent;
@@ -210,6 +225,8 @@ textarea.form-control {
   margin-top: $form-check-input-margin-y;
   margin-left: -$form-check-input-gutter;
 
+  // Use [disabled] and :disabled for workaround https://github.com/twbs/bootstrap/issues/28247
+  &[disabled] ~ .form-check-label,
   &:disabled ~ .form-check-label {
     color: $text-muted;
   }
diff --git a/app/assets/v3/scss/lib/bootstrap/_functions.scss b/app/assets/v3/scss/lib/bootstrap/_functions.scss
index d2cc91d57a6..9c06603150e 100644
--- a/app/assets/v3/scss/lib/bootstrap/_functions.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_functions.scss
@@ -8,7 +8,7 @@
   $prev-key: null;
   $prev-num: null;
   @each $key, $num in $map {
-    @if $prev-num == null or unit($num) == "%" {
+    @if $prev-num == null or unit($num) == "%" or unit($prev-num) == "%" {
       // Do nothing
     } @else if not comparable($prev-num, $num) {
       @warn "Potentially invalid value for #{$map-name}: This map must be in ascending order, but key '#{$key}' has value #{$num} whose unit makes it incomparable to #{$prev-num}, the value of the previous key '#{$prev-key}' !";
@@ -23,10 +23,12 @@
 // Starts at zero
 // Used to ensure the min-width of the lowest breakpoint starts at 0.
 @mixin _assert-starts-at-zero($map, $map-name: "$grid-breakpoints") {
-  $values: map-values($map);
-  $first-value: nth($values, 1);
-  @if $first-value != 0 {
-    @warn "First breakpoint in #{$map-name} must start at 0, but starts at #{$first-value}.";
+  @if length($map) > 0 {
+    $values: map-values($map);
+    $first-value: nth($values, 1);
+    @if $first-value != 0 {
+      @warn "First breakpoint in #{$map-name} must start at 0, but starts at #{$first-value}.";
+    }
   }
 }
 
@@ -48,6 +50,25 @@
   @return $string;
 }
 
+// See https://codepen.io/kevinweber/pen/dXWoRw
+//
+// Requires the use of quotes around data URIs.
+
+@function escape-svg($string) {
+  @if str-index($string, "data:image/svg+xml") {
+    @each $char, $encoded in $escaped-characters {
+      // Do not escape the url brackets
+      @if str-index($string, "url(") == 1 {
+        $string: url("#{str-replace(str-slice($string, 6, -3), $char, $encoded)}");
+      } @else {
+        $string: str-replace($string, $char, $encoded);
+      }
+    }
+  }
+
+  @return $string;
+}
+
 // Color contrast
 @function color-yiq($color, $dark: $yiq-text-dark, $light: $yiq-text-light) {
   $r: red($color);
@@ -84,3 +105,40 @@
 
   @return mix($color-base, $color, $level * $theme-color-interval);
 }
+
+// Return valid calc
+@function add($value1, $value2, $return-calc: true) {
+  @if $value1 == null {
+    @return $value2;
+  }
+
+  @if $value2 == null {
+    @return $value1;
+  }
+
+  @if type-of($value1) == number and type-of($value2) == number and comparable($value1, $value2) {
+    @return $value1 + $value2;
+  }
+
+  @return if($return-calc == true, calc(#{$value1} + #{$value2}), $value1 + unquote(" + ") + $value2);
+}
+
+@function subtract($value1, $value2, $return-calc: true) {
+  @if $value1 == null and $value2 == null {
+    @return null;
+  }
+
+  @if $value1 == null {
+    @return -$value2;
+  }
+
+  @if $value2 == null {
+    @return $value1;
+  }
+
+  @if type-of($value1) == number and type-of($value2) == number and comparable($value1, $value2) {
+    @return $value1 - $value2;
+  }
+
+  @return if($return-calc == true, calc(#{$value1} - #{$value2}), $value1 + unquote(" - ") + $value2);
+}
diff --git a/app/assets/v3/scss/lib/bootstrap/_grid.scss b/app/assets/v3/scss/lib/bootstrap/_grid.scss
index a227515379c..0bfe5303b9f 100644
--- a/app/assets/v3/scss/lib/bootstrap/_grid.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_grid.scss
@@ -3,26 +3,47 @@
 // Set the container width, and override it for fixed navbars in media queries.
 
 @if $enable-grid-classes {
-  .container {
+  // Single container class with breakpoint max-widths
+  .container,
+  // 100% wide container at all breakpoints
+  .container-fluid {
     @include make-container();
-    @include make-container-max-widths();
   }
-}
 
-// Fluid container
-//
-// Utilizes the mixin meant for fixed width containers, but with 100% width for
-// fluid, full width layouts.
+  // Responsive containers that are 100% wide until a breakpoint
+  @each $breakpoint, $container-max-width in $container-max-widths {
+    .container-#{$breakpoint} {
+      @extend .container-fluid;
+    }
 
-@if $enable-grid-classes {
-  .container-fluid {
-    @include make-container();
+    @include media-breakpoint-up($breakpoint, $grid-breakpoints) {
+      %responsive-container-#{$breakpoint} {
+        max-width: $container-max-width;
+      }
+
+      // Extend each breakpoint which is smaller or equal to the current breakpoint
+      $extend-breakpoint: true;
+
+      @each $name, $width in $grid-breakpoints {
+        @if ($extend-breakpoint) {
+          .container#{breakpoint-infix($name, $grid-breakpoints)} {
+            @extend %responsive-container-#{$breakpoint};
+          }
+
+          // Once the current breakpoint is reached, stop extending
+          @if ($breakpoint == $name) {
+            $extend-breakpoint: false;
+          }
+        }
+      }
+    }
   }
 }
 
+
 // Row
 //
-// Rows contain and clear the floats of your columns.
+// Rows contain your columns.
 
 @if $enable-grid-classes {
   .row {
diff --git a/app/assets/v3/scss/lib/bootstrap/_images.scss b/app/assets/v3/scss/lib/bootstrap/_images.scss
index cb9795e272a..b11b45a37bb 100644
--- a/app/assets/v3/scss/lib/bootstrap/_images.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_images.scss
@@ -6,7 +6,7 @@
 // which weren't expecting the images within themselves to be involuntarily resized.
 // See also https://github.com/twbs/bootstrap/issues/18178
 .img-fluid {
-  @include img-fluid;
+  @include img-fluid();
 }
 
 
@@ -19,7 +19,7 @@
   @include box-shadow($thumbnail-box-shadow);
 
   // Keep them at most 100% wide
-  @include img-fluid;
+  @include img-fluid();
 }
 
 //
diff --git a/app/assets/v3/scss/lib/bootstrap/_input-group.scss b/app/assets/v3/scss/lib/bootstrap/_input-group.scss
index ac49f696cb3..d72ebeaba7a 100644
--- a/app/assets/v3/scss/lib/bootstrap/_input-group.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_input-group.scss
@@ -17,9 +17,8 @@
   > .custom-file {
     position: relative; // For focus state's z-index
     flex: 1 1 auto;
-    // Add width 1% and flex-basis auto to ensure that button will not wrap out
-    // the column. Applies to IE Edge+ and Firefox. Chrome does not require this.
     width: 1%;
+    min-width: 0; // https://stackoverflow.com/questions/36247140/why-dont-flex-items-shrink-past-content-size
     margin-bottom: 0;
 
     + .form-control,
@@ -43,7 +42,6 @@
 
   > .form-control,
   > .custom-select {
-    &:not(:last-child) { @include border-right-radius(0); }
     &:not(:first-child) { @include border-left-radius(0); }
   }
 
@@ -54,9 +52,24 @@
     align-items: center;
 
     &:not(:last-child) .custom-file-label,
-    &:not(:last-child) .custom-file-label::after { @include border-right-radius(0); }
     &:not(:first-child) .custom-file-label { @include border-left-radius(0); }
   }
+
+  &:not(.has-validation) {
+    > .form-control:not(:last-child),
+    > .custom-select:not(:last-child),
+    > .custom-file:not(:last-child) .custom-file-label::after {
+      @include border-right-radius(0);
+    }
+  }
+
+  &.has-validation {
+    > .form-control:nth-last-child(n + 3),
+    > .custom-select:nth-last-child(n + 3),
+    > .custom-file:nth-last-child(n + 3) .custom-file-label::after {
+      @include border-right-radius(0);
+    }
+  }
 }
 
 
@@ -176,8 +189,10 @@
 
 .input-group > .input-group-prepend > .btn,
 .input-group > .input-group-prepend > .input-group-text,
-.input-group > .input-group-append:not(:last-child) > .btn,
-.input-group > .input-group-append:not(:last-child) > .input-group-text,
+.input-group:not(.has-validation) > .input-group-append:not(:last-child) > .btn,
+.input-group:not(.has-validation) > .input-group-append:not(:last-child) > .input-group-text,
+.input-group.has-validation > .input-group-append:nth-last-child(n + 3) > .btn,
+.input-group.has-validation > .input-group-append:nth-last-child(n + 3) > .input-group-text,
 .input-group > .input-group-append:last-child > .btn:not(:last-child):not(.dropdown-toggle),
 .input-group > .input-group-append:last-child > .input-group-text:not(:last-child) {
   @include border-right-radius(0);
diff --git a/app/assets/v3/scss/lib/bootstrap/_list-group.scss b/app/assets/v3/scss/lib/bootstrap/_list-group.scss
index 3f80687ab48..ec25ba8a1f0 100644
--- a/app/assets/v3/scss/lib/bootstrap/_list-group.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_list-group.scss
@@ -9,6 +9,7 @@
   // No need to set list-style: none; since .list-group-item is block level
   padding-left: 0; // reset padding because ul and ol
   margin-bottom: 0;
+  @include border-radius($list-group-border-radius);
 }
 
 
@@ -23,7 +24,7 @@
   text-align: inherit; // For `<button>`s (anchors inherit)
 
   // Hover state
-  @include hover-focus {
+  @include hover-focus() {
     z-index: 1; // Place hover/focus items above their siblings for proper border styling
     color: $list-group-action-hover-color;
     text-decoration: none;
@@ -45,19 +46,17 @@
   position: relative;
   display: block;
   padding: $list-group-item-padding-y $list-group-item-padding-x;
-  // Place the border on the list items and negative margin up for better styling
-  margin-bottom: -$list-group-border-width;
   color: $list-group-color;
+  text-decoration: if($link-decoration == none, null, none);
   background-color: $list-group-bg;
   border: $list-group-border-width solid $list-group-border-color;
 
   &:first-child {
-    @include border-top-radius($list-group-border-radius);
+    @include border-top-radius(inherit);
   }
 
   &:last-child {
-    margin-bottom: 0;
-    @include border-bottom-radius($list-group-border-radius);
+    @include border-bottom-radius(inherit);
   }
 
   &.disabled,
@@ -74,6 +73,15 @@
     background-color: $list-group-active-bg;
     border-color: $list-group-active-border-color;
   }
+
+  & + & {
+    border-top-width: 0;
+
+    &.active {
+      margin-top: -$list-group-border-width;
+      border-top-width: $list-group-border-width;
+    }
+  }
 }
 
 
@@ -88,20 +96,30 @@
     .list-group-horizontal#{$infix} {
       flex-direction: row;
 
-      .list-group-item {
-        margin-right: -$list-group-border-width;
-        margin-bottom: 0;
-
+      > .list-group-item {
         &:first-child {
-          @include border-left-radius($list-group-border-radius);
+          @include border-bottom-left-radius($list-group-border-radius);
           @include border-top-right-radius(0);
         }
 
         &:last-child {
-          margin-right: 0;
-          @include border-right-radius($list-group-border-radius);
+          @include border-top-right-radius($list-group-border-radius);
           @include border-bottom-left-radius(0);
         }
+
+        &.active {
+          margin-top: 0;
+        }
+
+        + .list-group-item {
+          border-top-width: $list-group-border-width;
+          border-left-width: 0;
+
+          &.active {
+            margin-left: -$list-group-border-width;
+            border-left-width: $list-group-border-width;
+          }
+        }
       }
     }
   }
@@ -114,26 +132,13 @@
 // useful within other components (e.g., cards).
 
 .list-group-flush {
-  .list-group-item {
-    border-right: 0;
-    border-left: 0;
-    @include border-radius(0);
+  @include border-radius(0);
 
-    &:last-child {
-      margin-bottom: -$list-group-border-width;
-    }
-  }
+  > .list-group-item {
+    border-width: 0 0 $list-group-border-width;
 
-  &:first-child {
-    .list-group-item:first-child {
-      border-top: 0;
-    }
-  }
-
-  &:last-child {
-    .list-group-item:last-child {
-      margin-bottom: 0;
-      border-bottom: 0;
+    &:last-child {
+      border-bottom-width: 0;
     }
   }
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/_mixins.scss b/app/assets/v3/scss/lib/bootstrap/_mixins.scss
index cc957843f26..7e7a23d254e 100644
--- a/app/assets/v3/scss/lib/bootstrap/_mixins.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_mixins.scss
@@ -22,7 +22,7 @@
 @import "mixins/text-truncate";
 @import "mixins/visibility";
 
-// // Components
+// Components
 @import "mixins/alert";
 @import "mixins/buttons";
 @import "mixins/caret";
@@ -33,14 +33,14 @@
 @import "mixins/forms";
 @import "mixins/table-row";
 
-// // Skins
+// Skins
 @import "mixins/background-variant";
 @import "mixins/border-radius";
 @import "mixins/box-shadow";
 @import "mixins/gradients";
 @import "mixins/transition";
 
-// // Layout
+// Layout
 @import "mixins/clearfix";
 @import "mixins/grid-framework";
 @import "mixins/grid";
diff --git a/app/assets/v3/scss/lib/bootstrap/_modal.scss b/app/assets/v3/scss/lib/bootstrap/_modal.scss
index 6b6770b32c2..e43c70fbb4b 100644
--- a/app/assets/v3/scss/lib/bootstrap/_modal.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_modal.scss
@@ -48,14 +48,19 @@
   .modal.show & {
     transform: $modal-show-transform;
   }
+
+  // When trying to close, animate focus to scale
+  .modal.modal-static & {
+    transform: $modal-scale-transform;
+  }
 }
 
 .modal-dialog-scrollable {
   display: flex; // IE10/11
-  max-height: calc(100% - #{$modal-dialog-margin * 2});
+  max-height: subtract(100%, $modal-dialog-margin * 2);
 
   .modal-content {
-    max-height: calc(100vh - #{$modal-dialog-margin * 2}); // IE10/11
+    max-height: subtract(100vh, $modal-dialog-margin * 2); // IE10/11
     overflow: hidden;
   }
 
@@ -72,12 +77,13 @@
 .modal-dialog-centered {
   display: flex;
   align-items: center;
-  min-height: calc(100% - #{$modal-dialog-margin * 2});
+  min-height: subtract(100%, $modal-dialog-margin * 2);
 
   // Ensure `modal-dialog-centered` extends the full height of the view (IE10/11)
   &::before {
     display: block; // IE10
-    height: calc(100vh - #{$modal-dialog-margin * 2});
+    height: subtract(100vh, $modal-dialog-margin * 2);
+    height: min-content; // Reset height to 0 except on IE
     content: "";
   }
 
@@ -138,7 +144,7 @@
   justify-content: space-between; // Put modal header elements (title and dismiss) on opposite ends
   padding: $modal-header-padding;
   border-bottom: $modal-header-border-width solid $modal-header-border-color;
-  @include border-top-radius($modal-content-border-radius);
+  @include border-top-radius($modal-content-inner-border-radius);
 
   .close {
     padding: $modal-header-padding;
@@ -158,7 +164,7 @@
 .modal-body {
   position: relative;
   // Enable `flex-grow: 1` so that the body take up as much space as possible
-  // when should there be a fixed height on `.modal-dialog`.
+  // when there should be a fixed height on `.modal-dialog`.
   flex: 1 1 auto;
   padding: $modal-inner-padding;
 }
@@ -166,15 +172,19 @@
 // Footer (for actions)
 .modal-footer {
   display: flex;
+  flex-wrap: wrap;
   align-items: center; // vertically center
   justify-content: flex-end; // Right align buttons with flex property because text-align doesn't work on flex items
-  padding: $modal-inner-padding;
+  padding: $modal-inner-padding - $modal-footer-margin-between / 2;
   border-top: $modal-footer-border-width solid $modal-footer-border-color;
-  @include border-bottom-radius($modal-content-border-radius);
+  @include border-bottom-radius($modal-content-inner-border-radius);
 
-  // Easily place margin between footer elements
-  > :not(:first-child) { margin-left: .25rem; }
-  > :not(:last-child) { margin-right: .25rem; }
+  // Place margin between footer elements
+  // This solution is far from ideal because of the universal selector usage,
+  // but is needed to fix https://github.com/twbs/bootstrap/issues/24800
+  > * {
+    margin: $modal-footer-margin-between / 2;
+  }
 }
 
 // Measure scrollbar width for padding body during modal show/hide
@@ -195,18 +205,19 @@
   }
 
   .modal-dialog-scrollable {
-    max-height: calc(100% - #{$modal-dialog-margin-y-sm-up * 2});
+    max-height: subtract(100%, $modal-dialog-margin-y-sm-up * 2);
 
     .modal-content {
-      max-height: calc(100vh - #{$modal-dialog-margin-y-sm-up * 2});
+      max-height: subtract(100vh, $modal-dialog-margin-y-sm-up * 2);
     }
   }
 
   .modal-dialog-centered {
-    min-height: calc(100% - #{$modal-dialog-margin-y-sm-up * 2});
+    min-height: subtract(100%, $modal-dialog-margin-y-sm-up * 2);
 
     &::before {
-      height: calc(100vh - #{$modal-dialog-margin-y-sm-up * 2});
+      height: subtract(100vh, $modal-dialog-margin-y-sm-up * 2);
+      height: min-content;
     }
   }
 
diff --git a/app/assets/v3/scss/lib/bootstrap/_nav.scss b/app/assets/v3/scss/lib/bootstrap/_nav.scss
index e5519b3a4d2..fad684e57b4 100644
--- a/app/assets/v3/scss/lib/bootstrap/_nav.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_nav.scss
@@ -1,7 +1,7 @@
 // Base class
 //
 // Kickstart any navigation component with a set of style resets. Works with
-// `<nav>`s or `<ul>`s.
+// `<nav>`s, `<ul>`s or `<ol>`s.
 
 .nav {
   display: flex;
@@ -14,8 +14,9 @@
 .nav-link {
   display: block;
   padding: $nav-link-padding-y $nav-link-padding-x;
+  text-decoration: if($link-decoration == none, null, none);
 
-  @include hover-focus {
+  @include hover-focus() {
     text-decoration: none;
   }
 
@@ -34,15 +35,12 @@
 .nav-tabs {
   border-bottom: $nav-tabs-border-width solid $nav-tabs-border-color;
 
-  .nav-item {
-    margin-bottom: -$nav-tabs-border-width;
-  }
-
   .nav-link {
+    margin-bottom: -$nav-tabs-border-width;
     border: $nav-tabs-border-width solid transparent;
     @include border-top-radius($nav-tabs-border-radius);
 
-    @include hover-focus {
+    @include hover-focus() {
       border-color: $nav-tabs-link-hover-border-color;
     }
 
@@ -91,6 +89,7 @@
 //
 
 .nav-fill {
+  > .nav-link,
   .nav-item {
     flex: 1 1 auto;
     text-align: center;
@@ -98,6 +97,7 @@
 }
 
 .nav-justified {
+  > .nav-link,
   .nav-item {
     flex-basis: 0;
     flex-grow: 1;
diff --git a/app/assets/v3/scss/lib/bootstrap/_navbar.scss b/app/assets/v3/scss/lib/bootstrap/_navbar.scss
index 5c6e96399e4..cf5b667908a 100644
--- a/app/assets/v3/scss/lib/bootstrap/_navbar.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_navbar.scss
@@ -25,13 +25,23 @@
 
   // Because flex properties aren't inherited, we need to redeclare these first
   // few properties so that content nested within behave properly.
-  > .container,
-  > .container-fluid {
+  %container-flex-properties {
     display: flex;
     flex-wrap: wrap;
     align-items: center;
     justify-content: space-between;
   }
+
+  .container,
+  .container-fluid {
+    @extend %container-flex-properties;
+  }
+
+  @each $breakpoint, $container-max-width in $container-max-widths {
+    > .container#{breakpoint-infix($breakpoint, $container-max-widths)} {
+      @extend %container-flex-properties;
+    }
+  }
 }
 
 
@@ -48,7 +58,7 @@
   line-height: inherit;
   white-space: nowrap;
 
-  @include hover-focus {
+  @include hover-focus() {
     text-decoration: none;
   }
 }
@@ -113,7 +123,7 @@
   border: $border-width solid transparent; // remove default button style
   @include border-radius($navbar-toggler-border-radius);
 
-  @include hover-focus {
+  @include hover-focus() {
     text-decoration: none;
   }
 }
@@ -126,8 +136,12 @@
   height: 1.5em;
   vertical-align: middle;
   content: "";
-  background: no-repeat center center;
-  background-size: 100% 100%;
+  background: 50% / 100% 100% no-repeat;
+}
+
+.navbar-nav-scroll {
+  max-height: $navbar-nav-scroll-max-height;
+  overflow-y: auto;
 }
 
 // Generate series of `.navbar-expand-*` responsive classes for configuring
@@ -139,11 +153,21 @@
 
     &#{$infix} {
       @include media-breakpoint-down($breakpoint) {
-        > .container,
-        > .container-fluid {
+        %container-navbar-expand-#{$breakpoint} {
           padding-right: 0;
           padding-left: 0;
         }
+
+        > .container,
+        > .container-fluid {
+          @extend %container-navbar-expand-#{$breakpoint};
+        }
+
+        @each $size, $container-max-width in $container-max-widths {
+          > .container#{breakpoint-infix($size, $container-max-widths)} {
+            @extend %container-navbar-expand-#{$breakpoint};
+          }
+        }
       }
 
       @include media-breakpoint-up($next) {
@@ -164,9 +188,23 @@
         }
 
         // For nesting containers, have to redeclare for alignment purposes
+        %container-nesting-#{$breakpoint} {
+          flex-wrap: nowrap;
+        }
+
         > .container,
         > .container-fluid {
-          flex-wrap: nowrap;
+          @extend %container-nesting-#{$breakpoint};
+        }
+
+        @each $size, $container-max-width in $container-max-widths {
+          > .container#{breakpoint-infix($size, $container-max-widths)} {
+            @extend %container-nesting-#{$breakpoint};
+          }
+        }
+
+        .navbar-nav-scroll {
+          overflow: visible;
         }
 
         .navbar-collapse {
@@ -194,7 +232,7 @@
   .navbar-brand {
     color: $navbar-light-brand-color;
 
-    @include hover-focus {
+    @include hover-focus() {
       color: $navbar-light-brand-hover-color;
     }
   }
@@ -203,7 +241,7 @@
     .nav-link {
       color: $navbar-light-color;
 
-      @include hover-focus {
+      @include hover-focus() {
         color: $navbar-light-hover-color;
       }
 
@@ -226,7 +264,7 @@
   }
 
   .navbar-toggler-icon {
-    background-image: $navbar-light-toggler-icon-bg;
+    background-image: escape-svg($navbar-light-toggler-icon-bg);
   }
 
   .navbar-text {
@@ -234,7 +272,7 @@
     a {
       color: $navbar-light-active-color;
 
-      @include hover-focus {
+      @include hover-focus() {
         color: $navbar-light-active-color;
       }
     }
@@ -246,7 +284,7 @@
   .navbar-brand {
     color: $navbar-dark-brand-color;
 
-    @include hover-focus {
+    @include hover-focus() {
       color: $navbar-dark-brand-hover-color;
     }
   }
@@ -255,7 +293,7 @@
     .nav-link {
       color: $navbar-dark-color;
 
-      @include hover-focus {
+      @include hover-focus() {
         color: $navbar-dark-hover-color;
       }
 
@@ -278,7 +316,7 @@
   }
 
   .navbar-toggler-icon {
-    background-image: $navbar-dark-toggler-icon-bg;
+    background-image: escape-svg($navbar-dark-toggler-icon-bg);
   }
 
   .navbar-text {
@@ -286,7 +324,7 @@
     a {
       color: $navbar-dark-active-color;
 
-      @include hover-focus {
+      @include hover-focus() {
         color: $navbar-dark-active-color;
       }
     }
diff --git a/app/assets/v3/scss/lib/bootstrap/_pagination.scss b/app/assets/v3/scss/lib/bootstrap/_pagination.scss
index b4345311d36..9313cc54758 100644
--- a/app/assets/v3/scss/lib/bootstrap/_pagination.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_pagination.scss
@@ -11,6 +11,7 @@
   margin-left: -$pagination-border-width;
   line-height: $pagination-line-height;
   color: $pagination-color;
+  text-decoration: if($link-decoration == none, null, none);
   background-color: $pagination-bg;
   border: $pagination-border-width solid $pagination-border-color;
 
@@ -23,7 +24,7 @@
   }
 
   &:focus {
-    z-index: 2;
+    z-index: 3;
     outline: $pagination-focus-outline;
     box-shadow: $pagination-focus-box-shadow;
   }
@@ -43,7 +44,7 @@
   }
 
   &.active .page-link {
-    z-index: 1;
+    z-index: 3;
     color: $pagination-active-color;
     background-color: $pagination-active-bg;
     border-color: $pagination-active-border-color;
@@ -65,9 +66,9 @@
 //
 
 .pagination-lg {
-  @include pagination-size($pagination-padding-y-lg, $pagination-padding-x-lg, $font-size-lg, $line-height-lg, $border-radius-lg);
+  @include pagination-size($pagination-padding-y-lg, $pagination-padding-x-lg, $font-size-lg, $line-height-lg, $pagination-border-radius-lg);
 }
 
 .pagination-sm {
-  @include pagination-size($pagination-padding-y-sm, $pagination-padding-x-sm, $font-size-sm, $line-height-sm, $border-radius-sm);
+  @include pagination-size($pagination-padding-y-sm, $pagination-padding-x-sm, $font-size-sm, $line-height-sm, $pagination-border-radius-sm);
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/_popover.scss b/app/assets/v3/scss/lib/bootstrap/_popover.scss
index f205e66818c..0ad76af3eeb 100644
--- a/app/assets/v3/scss/lib/bootstrap/_popover.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_popover.scss
@@ -22,7 +22,7 @@
     display: block;
     width: $popover-arrow-width;
     height: $popover-arrow-height;
-    margin: 0 $border-radius-lg;
+    margin: 0 $popover-border-radius;
 
     &::before,
     &::after {
@@ -39,7 +39,7 @@
   margin-bottom: $popover-arrow-height;
 
   > .arrow {
-    bottom: calc((#{$popover-arrow-height} + #{$popover-border-width}) * -1);
+    bottom: subtract(-$popover-arrow-height, $popover-border-width);
 
     &::before {
       bottom: 0;
@@ -59,10 +59,10 @@
   margin-left: $popover-arrow-height;
 
   > .arrow {
-    left: calc((#{$popover-arrow-height} + #{$popover-border-width}) * -1);
+    left: subtract(-$popover-arrow-height, $popover-border-width);
     width: $popover-arrow-height;
     height: $popover-arrow-width;
-    margin: $border-radius-lg 0; // make sure the arrow does not touch the popover's rounded corners
+    margin: $popover-border-radius 0; // make sure the arrow does not touch the popover's rounded corners
 
     &::before {
       left: 0;
@@ -82,7 +82,7 @@
   margin-top: $popover-arrow-height;
 
   > .arrow {
-    top: calc((#{$popover-arrow-height} + #{$popover-border-width}) * -1);
+    top: subtract(-$popover-arrow-height, $popover-border-width);
 
     &::before {
       top: 0;
@@ -114,10 +114,10 @@
   margin-right: $popover-arrow-height;
 
   > .arrow {
-    right: calc((#{$popover-arrow-height} + #{$popover-border-width}) * -1);
+    right: subtract(-$popover-arrow-height, $popover-border-width);
     width: $popover-arrow-height;
     height: $popover-arrow-width;
-    margin: $border-radius-lg 0; // make sure the arrow does not touch the popover's rounded corners
+    margin: $popover-border-radius 0; // make sure the arrow does not touch the popover's rounded corners
 
     &::before {
       right: 0;
@@ -157,8 +157,7 @@
   color: $popover-header-color;
   background-color: $popover-header-bg;
   border-bottom: $popover-border-width solid darken($popover-header-bg, 5%);
-  $offset-border-width: calc(#{$border-radius-lg} - #{$popover-border-width});
-  @include border-top-radius($offset-border-width);
+  @include border-top-radius($popover-inner-border-radius);
 
   &:empty {
     display: none;
diff --git a/app/assets/v3/scss/lib/bootstrap/_print.scss b/app/assets/v3/scss/lib/bootstrap/_print.scss
index 61b60b9807c..8f73024a8bb 100644
--- a/app/assets/v3/scss/lib/bootstrap/_print.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_print.scss
@@ -1,6 +1,6 @@
 // stylelint-disable declaration-no-important, selector-no-qualifying-type
 
-// Source: https://github.com/h5bp/html5-boilerplate/blob/master/src/css/main.css
+// Source: https://github.com/h5bp/main.css/blob/master/src/_print.css
 
 // ==========================================================================
 // Print styles.
@@ -57,7 +57,7 @@
 
     //
     // Printing Tables:
-    // http://css-discuss.incutio.com/wiki/Printing_Tables
+    // https://web.archive.org/web/20180815150934/http://css-discuss.incutio.com/wiki/Printing_Tables
     //
 
     thead {
diff --git a/app/assets/v3/scss/lib/bootstrap/_progress.scss b/app/assets/v3/scss/lib/bootstrap/_progress.scss
index ab9ea0ffbef..e206474a833 100644
--- a/app/assets/v3/scss/lib/bootstrap/_progress.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_progress.scss
@@ -10,6 +10,7 @@
   display: flex;
   height: $progress-height;
   overflow: hidden; // force rounded corners by cropping it
+  line-height: 0;
   @include font-size($progress-font-size);
   background-color: $progress-bg;
   @include border-radius($progress-border-radius);
@@ -20,6 +21,7 @@
   display: flex;
   flex-direction: column;
   justify-content: center;
+  overflow: hidden;
   color: $progress-bar-color;
   text-align: center;
   white-space: nowrap;
@@ -34,10 +36,12 @@
 
 @if $enable-transitions {
   .progress-bar-animated {
-    animation: progress-bar-stripes $progress-bar-animation-timing;
+    animation: $progress-bar-animation-timing progress-bar-stripes;
 
-    @media (prefers-reduced-motion: reduce) {
-      animation: none;
+    @if $enable-prefers-reduced-motion-media-query {
+      @media (prefers-reduced-motion: reduce) {
+        animation: none;
+      }
     }
   }
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/_reboot.scss b/app/assets/v3/scss/lib/bootstrap/_reboot.scss
index c55d42e44a3..cd93bfe2408 100644
--- a/app/assets/v3/scss/lib/bootstrap/_reboot.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_reboot.scss
@@ -1,4 +1,4 @@
-// stylelint-disable at-rule-no-vendor-prefix, declaration-no-important, selector-no-qualifying-type, property-no-vendor-prefix
+// stylelint-disable declaration-no-important, selector-no-qualifying-type, property-no-vendor-prefix
 
 // Reboot
 //
@@ -54,12 +54,16 @@ body {
   background-color: $body-bg; // 2
 }
 
-// Suppress the focus outline on elements that cannot be accessed via keyboard.
-// This prevents an unwanted focus outline from appearing around elements that
-// might still respond to pointer events.
+// Future-proof rule: in browsers that support :focus-visible, suppress the focus outline
+// on elements that programmatically receive focus but wouldn't normally show a visible
+// focus outline. In general, this would mean that the outline is only applied if the
+// interaction that led to the element receiving programmatic focus was a keyboard interaction,
+// or the browser has somehow determined that the user is primarily a keyboard user and/or
+// wants focus outlines to always be presented.
 //
-// Credit: https://github.com/suitcss/base
-[tabindex="-1"]:focus {
+// See https://developer.mozilla.org/en-US/docs/Web/CSS/:focus-visible
+// and https://developer.paciellogroup.com/blog/2018/03/focus-visible-and-backwards-compatibility/
+[tabindex="-1"]:focus:not(:focus-visible) {
   outline: 0 !important;
 }
 
@@ -184,30 +188,25 @@ a {
   text-decoration: $link-decoration;
   background-color: transparent; // Remove the gray background on active links in IE 10.
 
-  @include hover {
+  @include hover() {
     color: $link-hover-color;
     text-decoration: $link-hover-decoration;
   }
 }
 
-// And undo these styles for placeholder links/named anchors (without href)
-// which have not been made explicitly keyboard-focusable (without tabindex).
+// And undo these styles for placeholder links/named anchors (without href).
 // It would be more straightforward to just use a[href] in previous block, but that
 // causes specificity issues in many other styles that are too complex to fix.
 // See https://github.com/twbs/bootstrap/issues/19402
 
-a:not([href]):not([tabindex]) {
+a:not([href]):not([class]) {
   color: inherit;
   text-decoration: none;
 
-  @include hover-focus {
+  @include hover() {
     color: inherit;
     text-decoration: none;
   }
-
-  &:focus {
-    outline: 0;
-  }
 }
 
 
@@ -230,6 +229,9 @@ pre {
   margin-bottom: 1rem;
   // Don't allow content to break outside
   overflow: auto;
+  // Disable auto-hiding scrollbar in IE & legacy Edge to avoid overlap,
+  // making it impossible to interact with the content
+  -ms-overflow-style: scrollbar;
 }
 
 
@@ -276,10 +278,14 @@ caption {
   caption-side: bottom;
 }
 
+// 1. Removes font-weight bold by inheriting
+// 2. Matches default `<td>` alignment by inheriting `text-align`.
+// 3. Fix alignment for Safari
+
 th {
-  // Matches default `<td>` alignment by inheriting from the `<body>`, or the
-  // closest parent with a set `text-align`.
-  text-align: inherit;
+  font-weight: $table-th-font-weight; // 1
+  text-align: inherit; // 2
+  text-align: -webkit-match-parent; // 3
 }
 
 
@@ -297,17 +303,17 @@ label {
 //
 // Details at https://github.com/twbs/bootstrap/issues/24093
 button {
-  // stylelint-disable-next-line property-blacklist
+  // stylelint-disable-next-line property-disallowed-list
   border-radius: 0;
 }
 
-// Work around a Firefox/IE bug where the transparent `button` background
-// results in a loss of the default `button` focus styles.
-//
-// Credit: https://github.com/suitcss/base/
-button:focus {
-  outline: 1px dotted;
-  outline: 5px auto -webkit-focus-ring-color;
+// Explicitly remove focus outline in Chromium when it shouldn't be
+// visible (e.g. as result of mouse click or touch tap). It already
+// should be doing this automatically, but seems to currently be
+// confused and applies its very visible two-tone outline anyway.
+
+button:focus:not(:focus-visible) {
+  outline: 0;
 }
 
 input,
@@ -331,6 +337,13 @@ select {
   text-transform: none; // Remove the inheritance of text transform in Firefox
 }
 
+// Set the cursor for non-`<button>` buttons
+//
+// Details at https://github.com/twbs/bootstrap/pull/30562
+[role="button"] {
+  cursor: pointer;
+}
+
 // Remove the inheritance of word-wrap in Safari.
 //
 // Details at https://github.com/twbs/bootstrap/issues/24990
@@ -377,18 +390,6 @@ input[type="checkbox"] {
 }
 
 
-input[type="date"],
-input[type="time"],
-input[type="datetime-local"],
-input[type="month"] {
-  // Remove the default appearance of temporal inputs to avoid a Mobile Safari
-  // bug where setting a custom line-height prevents text from being vertically
-  // centered within the input.
-  // See https://bugs.webkit.org/show_bug.cgi?id=139848
-  // and https://github.com/twbs/bootstrap/issues/11266
-  -webkit-appearance: listbox;
-}
-
 textarea {
   overflow: auto; // Remove the default vertical scrollbar in IE.
   // Textareas should really only resize vertically so they don't break their (horizontal) containers.
diff --git a/app/assets/v3/scss/lib/bootstrap/_spinners.scss b/app/assets/v3/scss/lib/bootstrap/_spinners.scss
index 364a5c1a65f..7d8fba7a11b 100644
--- a/app/assets/v3/scss/lib/bootstrap/_spinners.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_spinners.scss
@@ -13,9 +13,9 @@
   vertical-align: text-bottom;
   border: $spinner-border-width solid currentColor;
   border-right-color: transparent;
-  // stylelint-disable-next-line property-blacklist
+  // stylelint-disable-next-line property-disallowed-list
   border-radius: 50%;
-  animation: spinner-border .75s linear infinite;
+  animation: .75s linear infinite spinner-border;
 }
 
 .spinner-border-sm {
@@ -34,6 +34,7 @@
   }
   50% {
     opacity: 1;
+    transform: none;
   }
 }
 
@@ -43,13 +44,22 @@
   height: $spinner-height;
   vertical-align: text-bottom;
   background-color: currentColor;
-  // stylelint-disable-next-line property-blacklist
+  // stylelint-disable-next-line property-disallowed-list
   border-radius: 50%;
   opacity: 0;
-  animation: spinner-grow .75s linear infinite;
+  animation: .75s linear infinite spinner-grow;
 }
 
 .spinner-grow-sm {
   width: $spinner-width-sm;
   height: $spinner-height-sm;
 }
+
+@if $enable-prefers-reduced-motion-media-query {
+  @media (prefers-reduced-motion: reduce) {
+    .spinner-border,
+    .spinner-grow {
+      animation-duration: 1.5s;
+    }
+  }
+}
diff --git a/app/assets/v3/scss/lib/bootstrap/_tables.scss b/app/assets/v3/scss/lib/bootstrap/_tables.scss
index b7ab3d5062d..5fd77a4eb0d 100644
--- a/app/assets/v3/scss/lib/bootstrap/_tables.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_tables.scss
@@ -84,7 +84,7 @@
 
 .table-hover {
   tbody tr {
-    @include hover {
+    @include hover() {
       color: $table-hover-color;
       background-color: $table-hover-bg;
     }
@@ -142,14 +142,14 @@
   }
 
   &.table-striped {
-    tbody tr:nth-of-type(odd) {
+    tbody tr:nth-of-type(#{$table-striped-order}) {
       background-color: $table-dark-accent-bg;
     }
   }
 
   &.table-hover {
     tbody tr {
-      @include hover {
+      @include hover() {
         color: $table-dark-hover-color;
         background-color: $table-dark-hover-bg;
       }
diff --git a/app/assets/v3/scss/lib/bootstrap/_toasts.scss b/app/assets/v3/scss/lib/bootstrap/_toasts.scss
index 6aa5352a383..f9ca8d91cd3 100644
--- a/app/assets/v3/scss/lib/bootstrap/_toasts.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_toasts.scss
@@ -1,13 +1,14 @@
 .toast {
+  // Prevents from shrinking in IE11, when in a flex container
+  // See https://github.com/twbs/bootstrap/issues/28341
+  flex-basis: $toast-max-width;
   max-width: $toast-max-width;
-  overflow: hidden; // cheap rounded corners on nested items
   @include font-size($toast-font-size);
   color: $toast-color;
   background-color: $toast-background-color;
   background-clip: padding-box;
   border: $toast-border-width solid $toast-border-color;
   box-shadow: $toast-box-shadow;
-  backdrop-filter: blur(10px);
   opacity: 0;
   @include border-radius($toast-border-radius);
 
@@ -37,6 +38,7 @@
   background-color: $toast-header-background-color;
   background-clip: padding-box;
   border-bottom: $toast-border-width solid $toast-header-border-color;
+  @include border-top-radius(subtract($toast-border-radius, $toast-border-width));
 }
 
 .toast-body {
diff --git a/app/assets/v3/scss/lib/bootstrap/_type.scss b/app/assets/v3/scss/lib/bootstrap/_type.scss
index f8ed09065eb..3112a734bba 100644
--- a/app/assets/v3/scss/lib/bootstrap/_type.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_type.scss
@@ -1,4 +1,4 @@
-// stylelint-disable declaration-no-important, selector-list-comma-newline-after
+// stylelint-disable selector-list-comma-newline-after
 
 //
 // Headings
@@ -82,12 +82,12 @@ mark,
 //
 
 .list-unstyled {
-  @include list-unstyled;
+  @include list-unstyled();
 }
 
 // Inline turns list items into inline-block
 .list-inline {
-  @include list-unstyled;
+  @include list-unstyled();
 }
 .list-inline-item {
   display: inline-block;
diff --git a/app/assets/v3/scss/lib/bootstrap/_utilities.scss b/app/assets/v3/scss/lib/bootstrap/_utilities.scss
index a5de31ba6a5..10e31dd7e96 100644
--- a/app/assets/v3/scss/lib/bootstrap/_utilities.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_utilities.scss
@@ -6,12 +6,13 @@
 @import "utilities/embed";
 @import "utilities/flex";
 @import "utilities/float";
+@import "utilities/interactions";
 @import "utilities/overflow";
 @import "utilities/position";
 @import "utilities/screenreaders";
 @import "utilities/shadows";
 @import "utilities/sizing";
-@import "utilities/stretched-link";
 @import "utilities/spacing";
+@import "utilities/stretched-link";
 @import "utilities/text";
 @import "utilities/visibility";
diff --git a/app/assets/v3/scss/lib/bootstrap/_variables.scss b/app/assets/v3/scss/lib/bootstrap/_variables.scss
index d9e88df9a3f..0a260b96fb6 100644
--- a/app/assets/v3/scss/lib/bootstrap/_variables.scss
+++ b/app/assets/v3/scss/lib/bootstrap/_variables.scss
@@ -18,7 +18,6 @@ $gray-900: #212529 !default;
 $black:    #000 !default;
 
 $grays: () !default;
-// stylelint-disable-next-line scss/dollar-variable-default
 $grays: map-merge(
   (
     "100": $gray-100,
@@ -46,7 +45,6 @@ $teal:    #20c997 !default;
 $cyan:    #17a2b8 !default;
 
 $colors: () !default;
-// stylelint-disable-next-line scss/dollar-variable-default
 $colors: map-merge(
   (
     "blue":       $blue,
@@ -76,7 +74,6 @@ $light:         $gray-100 !default;
 $dark:          $gray-800 !default;
 
 $theme-colors: () !default;
-// stylelint-disable-next-line scss/dollar-variable-default
 $theme-colors: map-merge(
   (
     "primary":    $primary,
@@ -101,6 +98,15 @@ $yiq-contrasted-threshold:  150 !default;
 $yiq-text-dark:             $gray-900 !default;
 $yiq-text-light:            $white !default;
 
+// Characters which are escaped by the escape-svg function
+$escaped-characters: (
+  ("<", "%3c"),
+  (">", "%3e"),
+  ("#", "%23"),
+  ("(", "%28"),
+  (")", "%29"),
+) !default;
+
 
 // Options
 //
@@ -129,7 +135,6 @@ $enable-deprecation-messages:                 true !default;
 
 $spacer: 1rem !default;
 $spacers: () !default;
-// stylelint-disable-next-line scss/dollar-variable-default
 $spacers: map-merge(
   (
     0: 0,
@@ -144,7 +149,6 @@ $spacers: map-merge(
 
 // This variable affects the `.h-*` and `.w-*` classes.
 $sizes: () !default;
-// stylelint-disable-next-line scss/dollar-variable-default
 $sizes: map-merge(
   (
     25: 25%,
@@ -220,6 +224,7 @@ $container-max-widths: (
 
 $grid-columns:                12 !default;
 $grid-gutter-width:           30px !default;
+$grid-row-columns:            6 !default;
 
 
 // Components
@@ -254,7 +259,6 @@ $transition-fade:             opacity .15s linear !default;
 $transition-collapse:         height .35s ease !default;
 
 $embed-responsive-aspect-ratios: () !default;
-// stylelint-disable-next-line scss/dollar-variable-default
 $embed-responsive-aspect-ratios: join(
   (
     (21 9),
@@ -270,7 +274,7 @@ $embed-responsive-aspect-ratios: join(
 // Font, line-height, and color for body text, headings, and more.
 
 // stylelint-disable value-keyword-case
-$font-family-sans-serif:      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji" !default;
+$font-family-sans-serif:      -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "Liberation Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji" !default;
 $font-family-monospace:       SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace !default;
 $font-family-base:            $font-family-sans-serif !default;
 // stylelint-enable value-keyword-case
@@ -359,6 +363,7 @@ $table-border-color:          $border-color !default;
 
 $table-head-bg:               $gray-200 !default;
 $table-head-color:            $gray-700 !default;
+$table-th-font-weight:        null !default;
 
 $table-dark-color:            $white !default;
 $table-dark-bg:               $gray-800 !default;
@@ -366,7 +371,6 @@ $table-dark-accent-bg:        rgba($white, .05) !default;
 $table-dark-hover-color:      $table-dark-color !default;
 $table-dark-hover-bg:         rgba($white, .075) !default;
 $table-dark-border-color:     lighten($table-dark-bg, 7.5%) !default;
-$table-dark-color:            $white !default;
 
 $table-striped-order:         odd !default;
 
@@ -412,6 +416,7 @@ $btn-padding-x:               $input-btn-padding-x !default;
 $btn-font-family:             $input-btn-font-family !default;
 $btn-font-size:               $input-btn-font-size !default;
 $btn-line-height:             $input-btn-line-height !default;
+$btn-white-space:             null !default; // Set to `nowrap` to prevent text wrapping
 
 $btn-padding-y-sm:            $input-btn-padding-y-sm !default;
 $btn-padding-x-sm:            $input-btn-padding-x-sm !default;
@@ -488,13 +493,13 @@ $input-plaintext-color:                 $body-color !default;
 
 $input-height-border:                   $input-border-width * 2 !default;
 
-$input-height-inner:                    calc(#{$input-line-height * 1em} + #{$input-padding-y * 2}) !default;
-$input-height-inner-half:               calc(#{$input-line-height * .5em} + #{$input-padding-y}) !default;
-$input-height-inner-quarter:            calc(#{$input-line-height * .25em} + #{$input-padding-y / 2}) !default;
+$input-height-inner:                    add($input-line-height * 1em, $input-padding-y * 2) !default;
+$input-height-inner-half:               add($input-line-height * .5em, $input-padding-y) !default;
+$input-height-inner-quarter:            add($input-line-height * .25em, $input-padding-y / 2) !default;
 
-$input-height:                          calc(#{$input-line-height * 1em} + #{$input-padding-y * 2} + #{$input-height-border}) !default;
-$input-height-sm:                       calc(#{$input-line-height-sm * 1em} + #{$input-btn-padding-y-sm * 2} + #{$input-height-border}) !default;
-$input-height-lg:                       calc(#{$input-line-height-lg * 1em} + #{$input-btn-padding-y-lg * 2} + #{$input-height-border}) !default;
+$input-height:                          add($input-line-height * 1em, add($input-padding-y * 2, $input-height-border, false)) !default;
+$input-height-sm:                       add($input-line-height-sm * 1em, add($input-padding-y-sm * 2, $input-height-border, false)) !default;
+$input-height-lg:                       add($input-line-height-lg * 1em, add($input-padding-y-lg * 2, $input-height-border, false)) !default;
 
 $input-transition:                      border-color .15s ease-in-out, box-shadow .15s ease-in-out !default;
 
@@ -518,6 +523,7 @@ $custom-forms-transition:               background-color .15s ease-in-out, borde
 
 $custom-control-gutter:                 .5rem !default;
 $custom-control-spacer-x:               1rem !default;
+$custom-control-cursor:                 null !default;
 
 $custom-control-indicator-size:         1rem !default;
 $custom-control-indicator-bg:           $input-bg !default;
@@ -527,13 +533,15 @@ $custom-control-indicator-box-shadow:   $input-box-shadow !default;
 $custom-control-indicator-border-color: $gray-500 !default;
 $custom-control-indicator-border-width: $input-border-width !default;
 
+$custom-control-label-color:            null !default;
+
 $custom-control-indicator-disabled-bg:          $input-disabled-bg !default;
 $custom-control-label-disabled-color:           $gray-600 !default;
 
 $custom-control-indicator-checked-color:        $component-active-color !default;
 $custom-control-indicator-checked-bg:           $component-active-bg !default;
 $custom-control-indicator-checked-disabled-bg:  rgba(theme-color("primary"), .5) !default;
-$custom-control-indicator-checked-box-shadow:   none !default;
+$custom-control-indicator-checked-box-shadow:   null !default;
 $custom-control-indicator-checked-border-color: $custom-control-indicator-checked-bg !default;
 
 $custom-control-indicator-focus-box-shadow:     $input-focus-box-shadow !default;
@@ -541,24 +549,24 @@ $custom-control-indicator-focus-border-color:   $input-focus-border-color !defau
 
 $custom-control-indicator-active-color:         $component-active-color !default;
 $custom-control-indicator-active-bg:            lighten($component-active-bg, 35%) !default;
-$custom-control-indicator-active-box-shadow:    none !default;
+$custom-control-indicator-active-box-shadow:    null !default;
 $custom-control-indicator-active-border-color:  $custom-control-indicator-active-bg !default;
 
 $custom-checkbox-indicator-border-radius:       $border-radius !default;
-$custom-checkbox-indicator-icon-checked:        str-replace(url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='#{$custom-control-indicator-checked-color}' d='M6.564.75l-3.59 3.612-1.538-1.55L0 4.26 2.974 7.25 8 2.193z'/%3e%3c/svg%3e"), "#", "%23") !default;
+$custom-checkbox-indicator-icon-checked:        url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='8' height='8' viewBox='0 0 8 8'><path fill='#{$custom-control-indicator-checked-color}' d='M6.564.75l-3.59 3.612-1.538-1.55L0 4.26l2.974 2.99L8 2.193z'/></svg>") !default;
 
 $custom-checkbox-indicator-indeterminate-bg:           $component-active-bg !default;
 $custom-checkbox-indicator-indeterminate-color:        $custom-control-indicator-checked-color !default;
-$custom-checkbox-indicator-icon-indeterminate:         str-replace(url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 4'%3e%3cpath stroke='#{$custom-checkbox-indicator-indeterminate-color}' d='M0 2h4'/%3e%3c/svg%3e"), "#", "%23") !default;
-$custom-checkbox-indicator-indeterminate-box-shadow:   none !default;
+$custom-checkbox-indicator-icon-indeterminate:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='4' height='4' viewBox='0 0 4 4'><path stroke='#{$custom-checkbox-indicator-indeterminate-color}' d='M0 2h4'/></svg>") !default;
+$custom-checkbox-indicator-indeterminate-box-shadow:   null !default;
 $custom-checkbox-indicator-indeterminate-border-color: $custom-checkbox-indicator-indeterminate-bg !default;
 
 $custom-radio-indicator-border-radius:          50% !default;
-$custom-radio-indicator-icon-checked:           str-replace(url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='#{$custom-control-indicator-checked-color}'/%3e%3c/svg%3e"), "#", "%23") !default;
+$custom-radio-indicator-icon-checked:           url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='-4 -4 8 8'><circle r='3' fill='#{$custom-control-indicator-checked-color}'/></svg>") !default;
 
 $custom-switch-width:                           $custom-control-indicator-size * 1.75 !default;
 $custom-switch-indicator-border-radius:         $custom-control-indicator-size / 2 !default;
-$custom-switch-indicator-size:                  calc(#{$custom-control-indicator-size} - #{$custom-control-indicator-border-width * 4}) !default;
+$custom-switch-indicator-size:                  subtract($custom-control-indicator-size, $custom-control-indicator-border-width * 4) !default;
 
 $custom-select-padding-y:           $input-padding-y !default;
 $custom-select-padding-x:           $input-padding-x !default;
@@ -574,10 +582,10 @@ $custom-select-bg:                  $input-bg !default;
 $custom-select-disabled-bg:         $gray-200 !default;
 $custom-select-bg-size:             8px 10px !default; // In pixels because image dimensions
 $custom-select-indicator-color:     $gray-800 !default;
-$custom-select-indicator:           str-replace(url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 4 5'%3e%3cpath fill='#{$custom-select-indicator-color}' d='M2 0L0 2h4zm0 5L0 3h4z'/%3e%3c/svg%3e"), "#", "%23") !default;
-$custom-select-background:          $custom-select-indicator no-repeat right $custom-select-padding-x center / $custom-select-bg-size !default; // Used so we can have multiple background elements (e.g., arrow and feedback icon)
+$custom-select-indicator:           url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='4' height='5' viewBox='0 0 4 5'><path fill='#{$custom-select-indicator-color}' d='M2 0L0 2h4zm0 5L0 3h4z'/></svg>") !default;
+$custom-select-background:          escape-svg($custom-select-indicator) right $custom-select-padding-x center / $custom-select-bg-size no-repeat !default; // Used so we can have multiple background elements (e.g., arrow and feedback icon)
 
-$custom-select-feedback-icon-padding-right: calc((1em + #{2 * $custom-select-padding-y}) * 3 / 4 + #{$custom-select-padding-x + $custom-select-indicator-padding}) !default;
+$custom-select-feedback-icon-padding-right: add(1em * .75, (2 * $custom-select-padding-y * .75) + $custom-select-padding-x + $custom-select-indicator-padding) !default;
 $custom-select-feedback-icon-position:      center right ($custom-select-padding-x + $custom-select-indicator-padding) !default;
 $custom-select-feedback-icon-size:          $input-height-inner-half $input-height-inner-half !default;
 
@@ -650,12 +658,11 @@ $form-feedback-valid-color:         theme-color("success") !default;
 $form-feedback-invalid-color:       theme-color("danger") !default;
 
 $form-feedback-icon-valid-color:    $form-feedback-valid-color !default;
-$form-feedback-icon-valid:          str-replace(url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 8 8'%3e%3cpath fill='#{$form-feedback-icon-valid-color}' d='M2.3 6.73L.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/%3e%3c/svg%3e"), "#", "%23") !default;
+$form-feedback-icon-valid:          url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='8' height='8' viewBox='0 0 8 8'><path fill='#{$form-feedback-icon-valid-color}' d='M2.3 6.73L.6 4.53c-.4-1.04.46-1.4 1.1-.8l1.1 1.4 3.4-3.8c.6-.63 1.6-.27 1.2.7l-4 4.6c-.43.5-.8.4-1.1.1z'/></svg>") !default;
 $form-feedback-icon-invalid-color:  $form-feedback-invalid-color !default;
-$form-feedback-icon-invalid:        str-replace(url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='#{$form-feedback-icon-invalid-color}' viewBox='-2 -2 7 7'%3e%3cpath stroke='#{$form-feedback-icon-invalid-color}' d='M0 0l3 3m0-3L0 3'/%3e%3ccircle r='.5'/%3e%3ccircle cx='3' r='.5'/%3e%3ccircle cy='3' r='.5'/%3e%3ccircle cx='3' cy='3' r='.5'/%3e%3c/svg%3E"), "#", "%23") !default;
+$form-feedback-icon-invalid:        url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='none' stroke='#{$form-feedback-icon-invalid-color}' viewBox='0 0 12 12'><circle cx='6' cy='6' r='4.5'/><path stroke-linejoin='round' d='M5.8 3.6h.4L6 6.5z'/><circle cx='6' cy='8.2' r='.6' fill='#{$form-feedback-icon-invalid-color}' stroke='none'/></svg>") !default;
 
 $form-validation-states: () !default;
-// stylelint-disable-next-line scss/dollar-variable-default
 $form-validation-states: map-merge(
   (
     "valid": (
@@ -724,18 +731,20 @@ $navbar-toggler-padding-x:          .75rem !default;
 $navbar-toggler-font-size:          $font-size-lg !default;
 $navbar-toggler-border-radius:      $btn-border-radius !default;
 
+$navbar-nav-scroll-max-height:      75vh !default;
+
 $navbar-dark-color:                 rgba($white, .5) !default;
 $navbar-dark-hover-color:           rgba($white, .75) !default;
 $navbar-dark-active-color:          $white !default;
 $navbar-dark-disabled-color:        rgba($white, .25) !default;
-$navbar-dark-toggler-icon-bg:       str-replace(url("data:image/svg+xml,%3csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3e%3cpath stroke='#{$navbar-dark-color}' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e"), "#", "%23") !default;
+$navbar-dark-toggler-icon-bg:       url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'><path stroke='#{$navbar-dark-color}' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/></svg>") !default;
 $navbar-dark-toggler-border-color:  rgba($white, .1) !default;
 
 $navbar-light-color:                rgba($black, .5) !default;
 $navbar-light-hover-color:          rgba($black, .7) !default;
 $navbar-light-active-color:         rgba($black, .9) !default;
 $navbar-light-disabled-color:       rgba($black, .3) !default;
-$navbar-light-toggler-icon-bg:      str-replace(url("data:image/svg+xml,%3csvg viewBox='0 0 30 30' xmlns='http://www.w3.org/2000/svg'%3e%3cpath stroke='#{$navbar-light-color}' stroke-width='2' stroke-linecap='round' stroke-miterlimit='10' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e"), "#", "%23") !default;
+$navbar-light-toggler-icon-bg:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' width='30' height='30' viewBox='0 0 30 30'><path stroke='#{$navbar-light-color}' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/></svg>") !default;
 $navbar-light-toggler-border-color: rgba($black, .1) !default;
 
 $navbar-light-brand-color:                $navbar-light-active-color !default;
@@ -749,6 +758,7 @@ $navbar-dark-brand-hover-color:           $navbar-dark-active-color !default;
 // Dropdown menu container and contents.
 
 $dropdown-min-width:                10rem !default;
+$dropdown-padding-x:                0 !default;
 $dropdown-padding-y:                .5rem !default;
 $dropdown-spacer:                   .125rem !default;
 $dropdown-font-size:                $font-size-base !default;
@@ -757,24 +767,25 @@ $dropdown-bg:                       $white !default;
 $dropdown-border-color:             rgba($black, .15) !default;
 $dropdown-border-radius:            $border-radius !default;
 $dropdown-border-width:             $border-width !default;
-$dropdown-inner-border-radius:      calc(#{$dropdown-border-radius} - #{$dropdown-border-width}) !default;
+$dropdown-inner-border-radius:      subtract($dropdown-border-radius, $dropdown-border-width) !default;
 $dropdown-divider-bg:               $gray-200 !default;
 $dropdown-divider-margin-y:         $nav-divider-margin-y !default;
 $dropdown-box-shadow:               0 .5rem 1rem rgba($black, .175) !default;
 
 $dropdown-link-color:               $gray-900 !default;
 $dropdown-link-hover-color:         darken($gray-900, 5%) !default;
-$dropdown-link-hover-bg:            $gray-100 !default;
+$dropdown-link-hover-bg:            $gray-200 !default;
 
 $dropdown-link-active-color:        $component-active-color !default;
 $dropdown-link-active-bg:           $component-active-bg !default;
 
-$dropdown-link-disabled-color:      $gray-600 !default;
+$dropdown-link-disabled-color:      $gray-500 !default;
 
 $dropdown-item-padding-y:           .25rem !default;
 $dropdown-item-padding-x:           1.5rem !default;
 
 $dropdown-header-color:             $gray-600 !default;
+$dropdown-header-padding:           $dropdown-padding-y $dropdown-item-padding-x !default;
 
 
 // Pagination
@@ -807,6 +818,8 @@ $pagination-disabled-color:         $gray-600 !default;
 $pagination-disabled-bg:            $white !default;
 $pagination-disabled-border-color:  $gray-300 !default;
 
+$pagination-border-radius-sm:       $border-radius-sm !default;
+$pagination-border-radius-lg:       $border-radius-lg !default;
 
 // Jumbotron
 
@@ -822,9 +835,10 @@ $card-spacer-x:                     1.25rem !default;
 $card-border-width:                 $border-width !default;
 $card-border-radius:                $border-radius !default;
 $card-border-color:                 rgba($black, .125) !default;
-$card-inner-border-radius:          calc(#{$card-border-radius} - #{$card-border-width}) !default;
+$card-inner-border-radius:          subtract($card-border-radius, $card-border-width) !default;
 $card-cap-bg:                       rgba($black, .03) !default;
 $card-cap-color:                    null !default;
+$card-height:                       null !default;
 $card-color:                        null !default;
 $card-bg:                           $white !default;
 
@@ -871,6 +885,7 @@ $popover-max-width:                 276px !default;
 $popover-border-width:              $border-width !default;
 $popover-border-color:              rgba($black, .2) !default;
 $popover-border-radius:             $border-radius-lg !default;
+$popover-inner-border-radius:       subtract($popover-border-radius, $popover-border-width) !default;
 $popover-box-shadow:                0 .25rem .5rem rgba($black, .2) !default;
 
 $popover-header-bg:                 darken($popover-bg, 3%) !default;
@@ -929,6 +944,9 @@ $badge-pill-border-radius:          10rem !default;
 // Padding applied to the modal body
 $modal-inner-padding:               1rem !default;
 
+// Margin between elements in footer, must be lower than or equal to 2 * $modal-inner-padding
+$modal-footer-margin-between:       .5rem !default;
+
 $modal-dialog-margin:               .5rem !default;
 $modal-dialog-margin-y-sm-up:       1.75rem !default;
 
@@ -939,6 +957,7 @@ $modal-content-bg:                  $white !default;
 $modal-content-border-color:        rgba($black, .2) !default;
 $modal-content-border-width:        $border-width !default;
 $modal-content-border-radius:       $border-radius-lg !default;
+$modal-content-inner-border-radius: subtract($modal-content-border-radius, $modal-content-border-width) !default;
 $modal-content-box-shadow-xs:       0 .25rem .5rem rgba($black, .5) !default;
 $modal-content-box-shadow-sm-up:    0 .5rem 1rem rgba($black, .5) !default;
 
@@ -960,6 +979,7 @@ $modal-sm:                          300px !default;
 $modal-fade-transform:              translate(0, -50px) !default;
 $modal-show-transform:              none !default;
 $modal-transition:                  transform .3s ease-out !default;
+$modal-scale-transform:             scale(1.02) !default;
 
 
 // Alerts
@@ -1035,6 +1055,8 @@ $figure-caption-color:              $gray-600 !default;
 
 // Breadcrumbs
 
+$breadcrumb-font-size:              null !default;
+
 $breadcrumb-padding-y:              .75rem !default;
 $breadcrumb-padding-x:              1rem !default;
 $breadcrumb-item-padding:           .5rem !default;
@@ -1069,8 +1091,8 @@ $carousel-caption-color:             $white !default;
 
 $carousel-control-icon-width:        20px !default;
 
-$carousel-control-prev-icon-bg:      str-replace(url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='#{$carousel-control-color}' viewBox='0 0 8 8'%3e%3cpath d='M5.25 0l-4 4 4 4 1.5-1.5-2.5-2.5 2.5-2.5-1.5-1.5z'/%3e%3c/svg%3e"), "#", "%23") !default;
-$carousel-control-next-icon-bg:      str-replace(url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='#{$carousel-control-color}' viewBox='0 0 8 8'%3e%3cpath d='M2.75 0l-1.5 1.5 2.5 2.5-2.5 2.5 1.5 1.5 4-4-4-4z'/%3e%3c/svg%3e"), "#", "%23") !default;
+$carousel-control-prev-icon-bg:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' fill='#{$carousel-control-color}' width='8' height='8' viewBox='0 0 8 8'><path d='M5.25 0l-4 4 4 4 1.5-1.5L4.25 4l2.5-2.5L5.25 0z'/></svg>") !default;
+$carousel-control-next-icon-bg:      url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' fill='#{$carousel-control-color}' width='8' height='8' viewBox='0 0 8 8'><path d='M2.75 0l-1.5 1.5L3.75 4l-2.5 2.5L2.75 8l4-4-4-4z'/></svg>") !default;
 
 $carousel-transition-duration:       .6s !default;
 $carousel-transition:                transform $carousel-transition-duration ease-in-out !default; // Define transform transition first if using multiple transitions (e.g., `transform 2s ease, opacity .5s ease-out`)
@@ -1115,6 +1137,7 @@ $pre-scrollable-max-height:         340px !default;
 $displays: none, inline, inline-block, block, table, table-row, table-cell, flex, inline-flex !default;
 $overflows: auto, hidden !default;
 $positions: static, relative, absolute, fixed, sticky !default;
+$user-selects: all, auto, none !default;
 
 
 // Printing
diff --git a/app/assets/v3/scss/lib/bootstrap/bootstrap-grid.scss b/app/assets/v3/scss/lib/bootstrap/bootstrap-grid.scss
index d5f92a16ac3..6a664837727 100644
--- a/app/assets/v3/scss/lib/bootstrap/bootstrap-grid.scss
+++ b/app/assets/v3/scss/lib/bootstrap/bootstrap-grid.scss
@@ -1,8 +1,8 @@
 /*!
- * Bootstrap Grid v4.3.1 (https://getbootstrap.com/)
- * Copyright 2011-2019 The Bootstrap Authors
- * Copyright 2011-2019 Twitter, Inc.
- * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * Bootstrap Grid v4.6.0 (https://getbootstrap.com/)
+ * Copyright 2011-2021 The Bootstrap Authors
+ * Copyright 2011-2021 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
  */
 
 html {
@@ -19,6 +19,7 @@ html {
 @import "functions";
 @import "variables";
 
+@import "mixins/deprecate";
 @import "mixins/breakpoints";
 @import "mixins/grid-framework";
 @import "mixins/grid";
diff --git a/app/assets/v3/scss/lib/bootstrap/bootstrap-reboot.scss b/app/assets/v3/scss/lib/bootstrap/bootstrap-reboot.scss
index 2983f3f6df0..2b6cfc2f8c9 100644
--- a/app/assets/v3/scss/lib/bootstrap/bootstrap-reboot.scss
+++ b/app/assets/v3/scss/lib/bootstrap/bootstrap-reboot.scss
@@ -1,8 +1,8 @@
 /*!
- * Bootstrap Reboot v4.3.1 (https://getbootstrap.com/)
- * Copyright 2011-2019 The Bootstrap Authors
- * Copyright 2011-2019 Twitter, Inc.
- * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * Bootstrap Reboot v4.6.0 (https://getbootstrap.com/)
+ * Copyright 2011-2021 The Bootstrap Authors
+ * Copyright 2011-2021 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
  * Forked from Normalize.css, licensed MIT (https://github.com/necolas/normalize.css/blob/master/LICENSE.md)
  */
 
diff --git a/app/assets/v3/scss/lib/bootstrap/bootstrap.scss b/app/assets/v3/scss/lib/bootstrap/bootstrap.scss
index 9f15c2a8bc8..e86c49da541 100644
--- a/app/assets/v3/scss/lib/bootstrap/bootstrap.scss
+++ b/app/assets/v3/scss/lib/bootstrap/bootstrap.scss
@@ -1,8 +1,8 @@
 /*!
- * Bootstrap v4.3.1 (https://getbootstrap.com/)
- * Copyright 2011-2019 The Bootstrap Authors
- * Copyright 2011-2019 Twitter, Inc.
- * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
+ * Bootstrap v4.6.0 (https://getbootstrap.com/)
+ * Copyright 2011-2021 The Bootstrap Authors
+ * Copyright 2011-2021 Twitter, Inc.
+ * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
  */
 
 @import "functions";
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_background-variant.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_background-variant.scss
index 494439d2b45..80580189ad7 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_background-variant.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_background-variant.scss
@@ -2,20 +2,22 @@
 
 // Contextual backgrounds
 
-@mixin bg-variant($parent, $color) {
+@mixin bg-variant($parent, $color, $ignore-warning: false) {
   #{$parent} {
     background-color: $color !important;
   }
   a#{$parent},
   button#{$parent} {
-    @include hover-focus {
+    @include hover-focus() {
       background-color: darken($color, 10%) !important;
     }
   }
+  @include deprecate("The `bg-variant` mixin", "v4.4.0", "v5", $ignore-warning);
 }
 
-@mixin bg-gradient-variant($parent, $color) {
+@mixin bg-gradient-variant($parent, $color, $ignore-warning: false) {
   #{$parent} {
     background: $color linear-gradient(180deg, mix($body-bg, $color, 15%), $color) repeat-x !important;
   }
+  @include deprecate("The `bg-gradient-variant` mixin", "v4.5.0", "v5", $ignore-warning);
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_badge.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_badge.scss
index 64b29cb5791..f1c499141ac 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_badge.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_badge.scss
@@ -3,7 +3,7 @@
   background-color: $bg;
 
   @at-root a#{&} {
-    @include hover-focus {
+    @include hover-focus() {
       color: color-yiq($bg);
       background-color: darken($bg, 10%);
     }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_border-radius.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_border-radius.scss
index 88aeb37d818..4fad91d6768 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_border-radius.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_border-radius.scss
@@ -1,9 +1,22 @@
-// stylelint-disable property-blacklist
+// stylelint-disable property-disallowed-list
 // Single side border-radius
 
+// Helper function to replace negative values with 0
+@function valid-radius($radius) {
+  $return: ();
+  @each $value in $radius {
+    @if type-of($value) == number {
+      $return: append($return, max($value, 0));
+    } @else {
+      $return: append($return, $value);
+    }
+  }
+  @return $return;
+}
+
 @mixin border-radius($radius: $border-radius, $fallback-border-radius: false) {
   @if $enable-rounded {
-    border-radius: $radius;
+    border-radius: valid-radius($radius);
   }
   @else if $fallback-border-radius != false {
     border-radius: $fallback-border-radius;
@@ -12,52 +25,52 @@
 
 @mixin border-top-radius($radius) {
   @if $enable-rounded {
-    border-top-left-radius: $radius;
-    border-top-right-radius: $radius;
+    border-top-left-radius: valid-radius($radius);
+    border-top-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-right-radius($radius) {
   @if $enable-rounded {
-    border-top-right-radius: $radius;
-    border-bottom-right-radius: $radius;
+    border-top-right-radius: valid-radius($radius);
+    border-bottom-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-bottom-radius($radius) {
   @if $enable-rounded {
-    border-bottom-right-radius: $radius;
-    border-bottom-left-radius: $radius;
+    border-bottom-right-radius: valid-radius($radius);
+    border-bottom-left-radius: valid-radius($radius);
   }
 }
 
 @mixin border-left-radius($radius) {
   @if $enable-rounded {
-    border-top-left-radius: $radius;
-    border-bottom-left-radius: $radius;
+    border-top-left-radius: valid-radius($radius);
+    border-bottom-left-radius: valid-radius($radius);
   }
 }
 
 @mixin border-top-left-radius($radius) {
   @if $enable-rounded {
-    border-top-left-radius: $radius;
+    border-top-left-radius: valid-radius($radius);
   }
 }
 
 @mixin border-top-right-radius($radius) {
   @if $enable-rounded {
-    border-top-right-radius: $radius;
+    border-top-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-bottom-right-radius($radius) {
   @if $enable-rounded {
-    border-bottom-right-radius: $radius;
+    border-bottom-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-bottom-left-radius($radius) {
   @if $enable-rounded {
-    border-bottom-left-radius: $radius;
+    border-bottom-left-radius: valid-radius($radius);
   }
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_buttons.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_buttons.scss
index eee903f83ce..d6235aa27ca 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_buttons.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_buttons.scss
@@ -9,7 +9,7 @@
   border-color: $border;
   @include box-shadow($btn-box-shadow);
 
-  @include hover {
+  @include hover() {
     color: color-yiq($hover-background);
     @include gradient-bg($hover-background);
     border-color: $hover-border;
@@ -17,10 +17,13 @@
 
   &:focus,
   &.focus {
-    // Avoid using mixin so we can pass custom focus shadow properly
+    color: color-yiq($hover-background);
+    @include gradient-bg($hover-background);
+    border-color: $hover-border;
     @if $enable-shadows {
-      box-shadow: $btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
+      @include box-shadow($btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5));
     } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
       box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
     }
   }
@@ -48,10 +51,10 @@
     border-color: $active-border;
 
     &:focus {
-      // Avoid using mixin so we can pass custom focus shadow properly
       @if $enable-shadows and $btn-active-box-shadow != none {
-        box-shadow: $btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
+        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5));
       } @else {
+        // Avoid using mixin so we can pass custom focus shadow properly
         box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
       }
     }
@@ -62,7 +65,7 @@
   color: $color;
   border-color: $color;
 
-  @include hover {
+  @include hover() {
     color: $color-hover;
     background-color: $active-background;
     border-color: $active-border;
@@ -87,10 +90,10 @@
     border-color: $active-border;
 
     &:focus {
-      // Avoid using mixin so we can pass custom focus shadow properly
       @if $enable-shadows and $btn-active-box-shadow != none {
-        box-shadow: $btn-active-box-shadow, 0 0 0 $btn-focus-width rgba($color, .5);
+        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba($color, .5));
       } @else {
+        // Avoid using mixin so we can pass custom focus shadow properly
         box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
       }
     }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_caret.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_caret.scss
index 8ecef65b476..27466495b28 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_caret.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_caret.scss
@@ -1,25 +1,25 @@
-@mixin caret-down {
+@mixin caret-down() {
   border-top: $caret-width solid;
   border-right: $caret-width solid transparent;
   border-bottom: 0;
   border-left: $caret-width solid transparent;
 }
 
-@mixin caret-up {
+@mixin caret-up() {
   border-top: 0;
   border-right: $caret-width solid transparent;
   border-bottom: $caret-width solid;
   border-left: $caret-width solid transparent;
 }
 
-@mixin caret-right {
+@mixin caret-right() {
   border-top: $caret-width solid transparent;
   border-right: 0;
   border-bottom: $caret-width solid transparent;
   border-left: $caret-width solid;
 }
 
-@mixin caret-left {
+@mixin caret-left() {
   border-top: $caret-width solid transparent;
   border-right: $caret-width solid;
   border-bottom: $caret-width solid transparent;
@@ -33,11 +33,11 @@
       vertical-align: $caret-vertical-align;
       content: "";
       @if $direction == down {
-        @include caret-down;
+        @include caret-down();
       } @else if $direction == up {
-        @include caret-up;
+        @include caret-up();
       } @else if $direction == right {
-        @include caret-right;
+        @include caret-right();
       }
     }
 
@@ -51,7 +51,7 @@
         margin-right: $caret-spacing;
         vertical-align: $caret-vertical-align;
         content: "";
-        @include caret-left;
+        @include caret-left();
       }
     }
 
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_float.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_float.scss
index adff88e7909..6b376a2580c 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_float.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_float.scss
@@ -1,14 +1,14 @@
 // stylelint-disable declaration-no-important
 
-@mixin float-left {
+@mixin float-left() {
   float: left !important;
   @include deprecate("The `float-left` mixin", "v4.3.0", "v5");
 }
-@mixin float-right {
+@mixin float-right() {
   float: right !important;
   @include deprecate("The `float-right` mixin", "v4.3.0", "v5");
 }
-@mixin float-none {
+@mixin float-none() {
   float: none !important;
   @include deprecate("The `float-none` mixin", "v4.3.0", "v5");
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_forms.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_forms.scss
index ea8a91a0247..a32163049c9 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_forms.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_forms.scss
@@ -10,21 +10,36 @@
 //
 // Example usage: change the default blue border and shadow to white for better
 // contrast against a dark gray background.
-@mixin form-control-focus() {
+@mixin form-control-focus($ignore-warning: false) {
   &:focus {
     color: $input-focus-color;
     background-color: $input-focus-bg;
     border-color: $input-focus-border-color;
     outline: 0;
-    // Avoid using mixin so we can pass custom focus shadow properly
     @if $enable-shadows {
-      box-shadow: $input-box-shadow, $input-focus-box-shadow;
+      @include box-shadow($input-box-shadow, $input-focus-box-shadow);
     } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
       box-shadow: $input-focus-box-shadow;
     }
   }
+  @include deprecate("The `form-control-focus()` mixin", "v4.4.0", "v5", $ignore-warning);
 }
 
+// This mixin uses an `if()` technique to be compatible with Dart Sass
+// See https://github.com/sass/sass/issues/1873#issuecomment-152293725 for more details
+@mixin form-validation-state-selector($state) {
+  @if ($state == "valid" or $state == "invalid") {
+    .was-validated #{if(&, "&", "")}:#{$state},
+    #{if(&, "&", "")}.is-#{$state} {
+      @content;
+    }
+  } @else {
+    #{if(&, "&", "")}.is-#{$state} {
+      @content;
+    }
+  }
+}
 
 @mixin form-validation-state($state, $color, $icon) {
   .#{$state}-feedback {
@@ -38,6 +53,7 @@
   .#{$state}-tooltip {
     position: absolute;
     top: 100%;
+    left: 0;
     z-index: 5;
     display: none;
     max-width: 100%; // Contain to parent when possible
@@ -48,18 +64,31 @@
     color: color-yiq($color);
     background-color: rgba($color, $form-feedback-tooltip-opacity);
     @include border-radius($form-feedback-tooltip-border-radius);
+
+    // See https://github.com/twbs/bootstrap/pull/31557
+    // Align tooltip to form elements
+    .form-row > .col > &,
+    .form-row > [class*="col-"] > & {
+      left: $form-grid-gutter-width / 2;
+    }
+  }
+
+  @include form-validation-state-selector($state) {
+    ~ .#{$state}-feedback,
+    ~ .#{$state}-tooltip {
+      display: block;
+    }
   }
 
   .form-control {
-    .was-validated &:#{$state},
-    &.is-#{$state} {
+    @include form-validation-state-selector($state) {
       border-color: $color;
 
       @if $enable-validation-icons {
         padding-right: $input-height-inner;
-        background-image: $icon;
+        background-image: escape-svg($icon);
         background-repeat: no-repeat;
-        background-position: center right $input-height-inner-quarter;
+        background-position: right $input-height-inner-quarter center;
         background-size: $input-height-inner-half $input-height-inner-half;
       }
 
@@ -67,18 +96,12 @@
         border-color: $color;
         box-shadow: 0 0 0 $input-focus-width rgba($color, .25);
       }
-
-      ~ .#{$state}-feedback,
-      ~ .#{$state}-tooltip {
-        display: block;
-      }
     }
   }
 
   // stylelint-disable-next-line selector-no-qualifying-type
   textarea.form-control {
-    .was-validated &:#{$state},
-    &.is-#{$state} {
+    @include form-validation-state-selector($state) {
       @if $enable-validation-icons {
         padding-right: $input-height-inner;
         background-position: top $input-height-inner-quarter right $input-height-inner-quarter;
@@ -87,41 +110,23 @@
   }
 
   .custom-select {
-    .was-validated &:#{$state},
-    &.is-#{$state} {
+    @include form-validation-state-selector($state) {
       border-color: $color;
 
       @if $enable-validation-icons {
         padding-right: $custom-select-feedback-icon-padding-right;
-        background: $custom-select-background, $icon $custom-select-bg no-repeat $custom-select-feedback-icon-position / $custom-select-feedback-icon-size;
+        background: $custom-select-background, $custom-select-bg escape-svg($icon) $custom-select-feedback-icon-position / $custom-select-feedback-icon-size no-repeat;
       }
 
       &:focus {
         border-color: $color;
         box-shadow: 0 0 0 $input-focus-width rgba($color, .25);
       }
-
-      ~ .#{$state}-feedback,
-      ~ .#{$state}-tooltip {
-        display: block;
-      }
-    }
-  }
-
-
-  .form-control-file {
-    .was-validated &:#{$state},
-    &.is-#{$state} {
-      ~ .#{$state}-feedback,
-      ~ .#{$state}-tooltip {
-        display: block;
-      }
     }
   }
 
   .form-check-input {
-    .was-validated &:#{$state},
-    &.is-#{$state} {
+    @include form-validation-state-selector($state) {
       ~ .form-check-label {
         color: $color;
       }
@@ -134,8 +139,7 @@
   }
 
   .custom-control-input {
-    .was-validated &:#{$state},
-    &.is-#{$state} {
+    @include form-validation-state-selector($state) {
       ~ .custom-control-label {
         color: $color;
 
@@ -144,11 +148,6 @@
         }
       }
 
-      ~ .#{$state}-feedback,
-      ~ .#{$state}-tooltip {
-        display: block;
-      }
-
       &:checked {
         ~ .custom-control-label::before {
           border-color: lighten($color, 10%);
@@ -170,17 +169,11 @@
 
   // custom file
   .custom-file-input {
-    .was-validated &:#{$state},
-    &.is-#{$state} {
+    @include form-validation-state-selector($state) {
       ~ .custom-file-label {
         border-color: $color;
       }
 
-      ~ .#{$state}-feedback,
-      ~ .#{$state}-tooltip {
-        display: block;
-      }
-
       &:focus {
         ~ .custom-file-label {
           border-color: $color;
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_grid-framework.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_grid-framework.scss
index 649c28bf77a..6fc8e856122 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_grid-framework.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_grid-framework.scss
@@ -15,12 +15,15 @@
   @each $breakpoint in map-keys($breakpoints) {
     $infix: breakpoint-infix($breakpoint, $breakpoints);
 
-    // Allow columns to stretch full width below their breakpoints
-    @for $i from 1 through $columns {
-      .col#{$infix}-#{$i} {
-        @extend %grid-column;
+    @if $columns > 0 {
+      // Allow columns to stretch full width below their breakpoints
+      @for $i from 1 through $columns {
+        .col#{$infix}-#{$i} {
+          @extend %grid-column;
+        }
       }
     }
+
     .col#{$infix},
     .col#{$infix}-auto {
       @extend %grid-column;
@@ -33,15 +36,24 @@
         flex-grow: 1;
         max-width: 100%;
       }
+
+      @if $grid-row-columns > 0 {
+        @for $i from 1 through $grid-row-columns {
+          .row-cols#{$infix}-#{$i} {
+            @include row-cols($i);
+          }
+        }
+      }
+
       .col#{$infix}-auto {
-        flex: 0 0 auto;
-        width: auto;
-        max-width: 100%; // Reset earlier grid tiers
+        @include make-col-auto();
       }
 
-      @for $i from 1 through $columns {
-        .col#{$infix}-#{$i} {
-          @include make-col($i, $columns);
+      @if $columns > 0 {
+        @for $i from 1 through $columns {
+          .col#{$infix}-#{$i} {
+            @include make-col($i, $columns);
+          }
         }
       }
 
@@ -53,11 +65,13 @@
         .order#{$infix}-#{$i} { order: $i; }
       }
 
-      // `$columns - 1` because offsetting by the width of an entire row isn't possible
-      @for $i from 0 through ($columns - 1) {
-        @if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
-          .offset#{$infix}-#{$i} {
-            @include make-col-offset($i, $columns);
+      @if $columns > 0 {
+        // `$columns - 1` because offsetting by the width of an entire row isn't possible
+        @for $i from 0 through ($columns - 1) {
+          @if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
+            .offset#{$infix}-#{$i} {
+              @include make-col-offset($i, $columns);
+            }
           }
         }
       }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_grid.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_grid.scss
index 924eb0cfc0f..19babc09fbd 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_grid.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_grid.scss
@@ -10,6 +10,12 @@
   margin-left: auto;
 }
 
+@mixin make-row($gutter: $grid-gutter-width) {
+  display: flex;
+  flex-wrap: wrap;
+  margin-right: -$gutter / 2;
+  margin-left: -$gutter / 2;
+}
 
 // For each breakpoint, define the maximum width of the container in a media query
 @mixin make-container-max-widths($max-widths: $container-max-widths, $breakpoints: $grid-breakpoints) {
@@ -18,13 +24,7 @@
       max-width: $container-max-width;
     }
   }
-}
-
-@mixin make-row($gutter: $grid-gutter-width) {
-  display: flex;
-  flex-wrap: wrap;
-  margin-right: -$gutter / 2;
-  margin-left: -$gutter / 2;
+  @include deprecate("The `make-container-max-widths` mixin", "v4.5.2", "v5");
 }
 
 @mixin make-col-ready($gutter: $grid-gutter-width) {
@@ -45,7 +45,25 @@
   max-width: percentage($size / $columns);
 }
 
+@mixin make-col-auto() {
+  flex: 0 0 auto;
+  width: auto;
+  max-width: 100%; // Reset earlier grid tiers
+}
+
 @mixin make-col-offset($size, $columns: $grid-columns) {
   $num: $size / $columns;
   margin-left: if($num == 0, 0, percentage($num));
 }
+
+// Row columns
+//
+// Specify on a parent element(e.g., .row) to force immediate children into NN
+// numberof columns. Supports wrapping to new lines, but does not do a Masonry
+// style grid.
+@mixin row-cols($count) {
+  > * {
+    flex: 0 0 100% / $count;
+    max-width: 100% / $count;
+  }
+}
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_hover.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_hover.scss
index 192f847e17e..409f8244e12 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_hover.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_hover.scss
@@ -9,18 +9,18 @@
 //
 // Issue: https://github.com/twbs/bootstrap/issues/25195
 
-@mixin hover {
+@mixin hover() {
   &:hover { @content; }
 }
 
-@mixin hover-focus {
+@mixin hover-focus() {
   &:hover,
   &:focus {
     @content;
   }
 }
 
-@mixin plain-hover-focus {
+@mixin plain-hover-focus() {
   &,
   &:hover,
   &:focus {
@@ -28,7 +28,7 @@
   }
 }
 
-@mixin hover-focus-active {
+@mixin hover-focus-active() {
   &:hover,
   &:focus,
   &:active {
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_image.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_image.scss
index a76a6082bac..3aaa0d70460 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_image.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_image.scss
@@ -7,7 +7,7 @@
 //
 // Keep images from scaling beyond the width of their parents.
 
-@mixin img-fluid {
+@mixin img-fluid() {
   // Part 1: Set a maximum relative to the parent
   max-width: 100%;
   // Part 2: Override the height to auto, otherwise images will be stretched
@@ -26,7 +26,7 @@
   // Autoprefixer takes care of adding -webkit-min-device-pixel-ratio and -o-min-device-pixel-ratio,
   // but doesn't convert dppx=>dpi.
   // There's no such thing as unprefixed min-device-pixel-ratio since it's nonstandard.
-  // Compatibility info: https://caniuse.com/#feat=css-media-resolution
+  // Compatibility info: https://caniuse.com/css-media-resolution
   @media only screen and (min-resolution: 192dpi), // IE9-11 don't support dppx
     only screen and (min-resolution: 2dppx) { // Standardized
     background-image: url($file-2x);
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_list-group.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_list-group.scss
index cd47a4e9fa8..0da35315611 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_list-group.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_list-group.scss
@@ -6,7 +6,7 @@
     background-color: $background;
 
     &.list-group-item-action {
-      @include hover-focus {
+      @include hover-focus() {
         color: $color;
         background-color: darken($background, 5%);
       }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_lists.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_lists.scss
index 25185626698..251cb073319 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_lists.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_lists.scss
@@ -1,7 +1,7 @@
 // Lists
 
 // Unstyled keeps list items block level, just removes default browser padding and list-style
-@mixin list-unstyled {
+@mixin list-unstyled() {
   padding-left: 0;
   list-style: none;
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_nav-divider.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_nav-divider.scss
index 4fb37b62247..3e0cceafef7 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_nav-divider.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_nav-divider.scss
@@ -2,9 +2,10 @@
 //
 // Dividers (basically an hr) within dropdowns and nav lists
 
-@mixin nav-divider($color: $nav-divider-color, $margin-y: $nav-divider-margin-y) {
+@mixin nav-divider($color: $nav-divider-color, $margin-y: $nav-divider-margin-y, $ignore-warning: false) {
   height: 0;
   margin: $margin-y 0;
   overflow: hidden;
   border-top: 1px solid $color;
+  @include deprecate("The `nav-divider()` mixin", "v4.4.0", "v5", $ignore-warning);
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_reset-text.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_reset-text.scss
index bfa9f6e9ad8..15b4407a0a0 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_reset-text.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_reset-text.scss
@@ -1,4 +1,4 @@
-@mixin reset-text {
+@mixin reset-text() {
   font-family: $font-family-base;
   // We deliberately do NOT reset font-size or word-wrap.
   font-style: normal;
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_screen-reader.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_screen-reader.scss
index 812591bc5e3..6913442b83f 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_screen-reader.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_screen-reader.scss
@@ -1,13 +1,14 @@
 // Only display content to screen readers
 //
-// See: https://a11yproject.com/posts/how-to-hide-content/
+// See: https://www.a11yproject.com/posts/2013-01-11-how-to-hide-content/
 // See: https://hugogiraudel.com/2016/10/13/css-hide-and-seek/
 
-@mixin sr-only {
+@mixin sr-only() {
   position: absolute;
   width: 1px;
   height: 1px;
   padding: 0;
+  margin: -1px; // Fix for https://github.com/twbs/bootstrap/issues/25686
   overflow: hidden;
   clip: rect(0, 0, 0, 0);
   white-space: nowrap;
@@ -20,7 +21,7 @@
 //
 // Credit: HTML5 Boilerplate
 
-@mixin sr-only-focusable {
+@mixin sr-only-focusable() {
   &:active,
   &:focus {
     position: static;
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_table-row.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_table-row.scss
index f8d61869a48..1ccde6b6c56 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_table-row.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_table-row.scss
@@ -26,7 +26,7 @@
     $hover-background: darken($background, 5%);
 
     .table-#{$state} {
-      @include hover {
+      @include hover() {
         background-color: $hover-background;
 
         > td,
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_text-emphasis.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_text-emphasis.scss
index 155d6ca8cf2..5eb8a551541 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_text-emphasis.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_text-emphasis.scss
@@ -2,15 +2,16 @@
 
 // Typography
 
-@mixin text-emphasis-variant($parent, $color) {
+@mixin text-emphasis-variant($parent, $color, $ignore-warning: false) {
   #{$parent} {
     color: $color !important;
   }
   @if $emphasized-link-hover-darken-percentage != 0 {
     a#{$parent} {
-      @include hover-focus {
+      @include hover-focus() {
         color: darken($color, $emphasized-link-hover-darken-percentage) !important;
       }
     }
   }
+  @include deprecate("`text-emphasis-variant()`", "v4.4.0", "v5", $ignore-warning);
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/mixins/_transition.scss b/app/assets/v3/scss/lib/bootstrap/mixins/_transition.scss
index 8ce35a6b836..54870bf6a8c 100644
--- a/app/assets/v3/scss/lib/bootstrap/mixins/_transition.scss
+++ b/app/assets/v3/scss/lib/bootstrap/mixins/_transition.scss
@@ -1,16 +1,26 @@
-// stylelint-disable property-blacklist
+// stylelint-disable property-disallowed-list
 @mixin transition($transition...) {
+  @if length($transition) == 0 {
+    $transition: $transition-base;
+  }
+
+  @if length($transition) > 1 {
+    @each $value in $transition {
+      @if $value == null or $value == none {
+        @warn "The keyword 'none' or 'null' must be used as a single argument.";
+      }
+    }
+  }
+
   @if $enable-transitions {
-    @if length($transition) == 0 {
-      transition: $transition-base;
-    } @else {
+    @if nth($transition, 1) != null {
       transition: $transition;
     }
-  }
 
-  @if $enable-prefers-reduced-motion-media-query {
-    @media (prefers-reduced-motion: reduce) {
-      transition: none;
+    @if $enable-prefers-reduced-motion-media-query and nth($transition, 1) != null and nth($transition, 1) != none {
+      @media (prefers-reduced-motion: reduce) {
+        transition: none;
+      }
     }
   }
 }
diff --git a/app/assets/v3/scss/lib/bootstrap/utilities/_background.scss b/app/assets/v3/scss/lib/bootstrap/utilities/_background.scss
index 1f18b2f3f36..3accbc4fd4f 100644
--- a/app/assets/v3/scss/lib/bootstrap/utilities/_background.scss
+++ b/app/assets/v3/scss/lib/bootstrap/utilities/_background.scss
@@ -1,12 +1,12 @@
 // stylelint-disable declaration-no-important
 
 @each $color, $value in $theme-colors {
-  @include bg-variant(".bg-#{$color}", $value);
+  @include bg-variant(".bg-#{$color}", $value, true);
 }
 
 @if $enable-gradients {
   @each $color, $value in $theme-colors {
-    @include bg-gradient-variant(".bg-gradient-#{$color}", $value);
+    @include bg-gradient-variant(".bg-gradient-#{$color}", $value, true);
   }
 }
 
diff --git a/app/assets/v3/scss/lib/bootstrap/utilities/_borders.scss b/app/assets/v3/scss/lib/bootstrap/utilities/_borders.scss
index 302f6bf8490..205f3fc24ef 100644
--- a/app/assets/v3/scss/lib/bootstrap/utilities/_borders.scss
+++ b/app/assets/v3/scss/lib/bootstrap/utilities/_borders.scss
@@ -1,4 +1,4 @@
-// stylelint-disable property-blacklist, declaration-no-important
+// stylelint-disable property-disallowed-list, declaration-no-important
 
 //
 // Border
diff --git a/app/assets/v3/scss/lib/bootstrap/utilities/_interactions.scss b/app/assets/v3/scss/lib/bootstrap/utilities/_interactions.scss
new file mode 100644
index 00000000000..cc75fc21b7e
--- /dev/null
+++ b/app/assets/v3/scss/lib/bootstrap/utilities/_interactions.scss
@@ -0,0 +1,5 @@
+// stylelint-disable declaration-no-important
+
+@each $value in $user-selects {
+  .user-select-#{$value} { user-select: $value !important; }
+}
diff --git a/app/assets/v3/scss/lib/bootstrap/utilities/_text.scss b/app/assets/v3/scss/lib/bootstrap/utilities/_text.scss
index 589e5687a86..3a9f83edf01 100644
--- a/app/assets/v3/scss/lib/bootstrap/utilities/_text.scss
+++ b/app/assets/v3/scss/lib/bootstrap/utilities/_text.scss
@@ -11,7 +11,7 @@
 .text-justify  { text-align: justify !important; }
 .text-wrap     { white-space: normal !important; }
 .text-nowrap   { white-space: nowrap !important; }
-.text-truncate { @include text-truncate; }
+.text-truncate { @include text-truncate(); }
 
 // Responsive alignment
 
@@ -45,7 +45,7 @@
 .text-white { color: $white !important; }
 
 @each $color, $value in $theme-colors {
-  @include text-emphasis-variant(".text-#{$color}", $value);
+  @include text-emphasis-variant(".text-#{$color}", $value, true);
 }
 
 .text-body { color: $body-color !important; }
@@ -63,8 +63,8 @@
 .text-decoration-none { text-decoration: none !important; }
 
 .text-break {
-  word-break: break-word !important; // IE & < Edge 18
-  overflow-wrap: break-word !important;
+  word-break: break-word !important; // Deprecated, but avoids issues with flex containers
+  word-wrap: break-word !important; // Used instead of `overflow-wrap` for IE & Edge Legacy
 }
 
 // Reset