editor.css

.friendlycode-base {
  font-family: "Open Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  overflow: hidden;
  background-color: #F5F5F5;
  color: #414244;
}

.friendlycode-base img {
  border: 0 none;
}

.friendlycode-loading > * {
  visibility: hidden;
}

.friendlycode-loading {
  position: absolute;
  top: 0;
  width: 100%;
  left: 0;
  right: 0;
  height: 41px;
  background: white;
  color: lightgray;
  border-bottom: 1px solid #D6D6D6;
  font-family: sans-serif;
  font-size: 12px;
  padding: 14px 0 0 42px;
  background-image: url(../img/throbber.gif);
  background-position: 20px 12px;
  background-repeat: no-repeat;
  -webkit-box-shadow: 0 5px 5px 0 rgba(233,233,233,0.5);
  box-shadow: 0 5px 5px 0 rgba(233,233,233,0.5);
  
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  
  -moz-animation-duration: 4s;
  -moz-animation-name: friendlycode-loading-fadein;
  -webkit-animation-duration: 4s;
  -webkit-animation-name: friendlycode-loading-fadein;
}

@-moz-keyframes friendlycode-loading-fadein {
  /* Slowly fade-in the loading message, so that users on really slow
   * connections will see it, but users on fast connections won't
   * see the distracting flicker of a loading message that only shows
   * itself for a split-second. */
  
  from {
    color: white;
  }
  
  to {
    color: lightgray;
  }
}

@-webkit-keyframes friendlycode-loading-fadein {
  from {
    color: white;
  }
  
  to {
    color: lightgray;
  }
}

.friendlycode-loading:before {
  content: 'Loading...';
}

.friendlycode-toolbar {
  position: absolute;
  z-index: 2;
  top: 0;

  height: 40px;    /* corresponds with .friendlycode-panes.top */
  width: 100%;
  margin: 0;
  padding: 0;

  border-bottom: 1px solid #D6D6D6;
  
  background: white;
  
  -webkit-box-shadow: 0 5px 5px 0 rgba(233,233,233,0.5);
  box-shadow: 0 5px 5px 0 rgba(233,233,233,0.5);
}

.nav-options {
  font-size: 12px;

  position: absolute;
  display: block;
  top: 0;
  width: 100%;
  height: 0;
}

.editor-pane-nav-options {
  position: absolute;
  top: 0;
  left: 0;
  width: 50%;
  height: 100%;
  border-right: 1px solid #D6D6D6;
  z-index: 2;
  height: 41px;
}

.preview-pane-nav-options {
  position: absolute;
  top: 0;
  left: 50%;
  width: 50%;
  height: 100%;
  z-index: 1;
}

.nav-options .nav-item {
  display: table-cell;
  height: 41px;
  text-align: center;
  vertical-align: middle;
  color: gray;
  padding: 0 5px;
  padding-right: 2em;
  white-space: nowrap;
  cursor: default;
  font-size: 14px;
  opacity: 0.33;
  -moz-transition: opacity 0.5s;
  -webkit-transition: opacity 0.5s;
  -o-transition: opacity 0.5s;
  
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  -khtml-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.nav-options .nav-item.enabled {
  cursor: pointer;
  opacity: 1.0;
}

.nav-options .nav-item.enabled:hover {
  color: #3D59FE;
}

@media screen and (max-width: 980px) {
  .nav-options .responsive,
  .nav-options .responsive:hover,
  .nav-options .nav-item.responsive.enabled {
    max-width: 30px;
    overflow: hidden;
    background-position: center center;
    color: transparent !important;
  }
  .nav-options .nav-item ul,
  .nav-options .nav-item ul li {
    max-width: 999px !important;
    width: auto !important;
    padding-right: 1em;
    color: black;
  }
  .nav-options .nav-item {
    border: none;
  }
}

@media screen and (max-width: 785px) {
  .editor-pane-nav-options {
    border: none;
  }
  .preview-pane-nav-options {
   left: 65%;
  }
  .preview-nav-item .icon {
    margin-right: 0 !important;
  }
  .preview-nav-item {
    border-left: 1px solid #D6D6D6 !important;
    border-right: 1px solid #D6D6D6 !important;
    padding-right: 10px !important;
  }
  .nav-options .nav-item.buttons {
    right: 30% !important;
  }
  .hints-nav-item {
    margin-left: 0 !important;
    left: 310px !important;
  }
}

@media screen and (max-width: 620px) {
  .editor-nav-item.nav-item,
  .preview-nav-item.nav-item {
    display: none !important;
  }
  .hints-nav-item {
    left: 180px !important;
  }
}

@media screen and (max-width: 420px) {
  .preview-pane-nav-options > div.nav-item.buttons {
    left: 0 !important;
    right: auto !important;
  }
}

.nav-options .nav-item ul li {
  color: #666;
}

.nav-options .nav-item ul li:hover {
  color: #666;
}

.preview-pane-nav-options > div.nav-item.buttons {
  cursor: default;
  opacity: 1.0;
}

.nav-options .nav-item.buttons {
  position: absolute;
  top: 5px;
  right: 0;
  width: 7em;
}

/* ------ nav button stylings ------ */

.nav-options .editor-nav-item,
.nav-options .preview-nav-item {
  font-weight: bold;
  font-size: 16px;
  opacity: 1.0;
  color: #3887F3;
}

.editor-nav-item .icon,
.preview-nav-item .icon {
  display: inline-block;
  width: 30px;
  background-repeat: no-repeat;
  background-position: center center;
  margin-right: 1em;
}

.editor-nav-item .icon {
  background-image: url("../img/editor-icon.png");
}

.preview-nav-item .icon {
  background-image: url("../img/preview-icon.png");
}

.preview-nav-item .preview-title {
  font-weight: bold;
  display: none;
}

.preview-nav-item .preview-title:before {
  content: ' for ';
  font-weight: normal;
}

.editor-nav-item .pane-indicator,
.preview-nav-item .pane-indicator {
  position: absolute;
  background-image: url("../img/indicator-arrow.png");
  background-repeat: no-repeat;
  top: 38px;
  left: 18px;
  width: 25px;
  height: 25px;
}

.undo-nav-item .icon {
  display: inline-block;
  width: 30px;

  background-image: url("../img/undo-grey.png");
  background-repeat: no-repeat;
  background-position: center center;
}

.undo-nav-item.enabled:hover .icon {
  background-image: url("../img/undo-blue.png");
}

.redo-nav-item .icon {
  display: inline-block;
  width: 30px;

  background-image: url("../img/redo-grey.png");
  background-repeat: no-repeat;
  background-position: center center;
}

.redo-nav-item.enabled:hover .icon {
  background-image: url("../img/redo-blue.png");
}

.text-nav-item .icon {
  display: inline-block;
  width: 40px;

  background-image: url("../img/text-size.png");
  background-repeat: no-repeat;
  background-position: center center;
}

.text-nav-item.enabled:hover .icon {
  background-image: url("../img/text-size-blue.png");
}

.text-size-options {
  position: absolute;
  display: none;
  list-style: none;
  text-align: left;
  padding-top: 14px;
}

.text-nav-item ul {
  margin: 0;
  padding: 0;
  padding-top: 35px;
}

.text-nav-item li {
  background-color: white;
  border: 1px solid C0C0C0;
  border-top: none;
  padding: 10px;

  background-repeat: no-repeat;
  background-position: 0 center;
  padding-left: 40px;
  width: 60px;

  border: 1px solid #D6D6D6;
  margin-top: -1px;
}

.text-size-options li.selected {
  background-color: #F4F4F4;
}

.text-size-options li:hover {
  background-color: rgb(200,235,255);
}

.text-size-options li[data-size=small] {
  background-image: url("../img/text-size-small.png");
  font-size: 12px;
}
.text-size-options li[data-size=normal] {
  background-image: url("../img/text-size-normal.png");
  font-size: 14px;
}
.text-size-options li[data-size=large] {
  background-image: url("../img/text-size-large.png");
  font-size: 18px;
}

.hints-nav-item {
  left: 100%;
  margin-left: -100px;
  position: absolute;
  top: 11px;
}

.hints-nav-item .checkbox {
  display: inline-block;
  border: 1px solid grey;
  border-radius: 2px;
  background-color: white;
  background-image: url("../img/checkbox-gradient.png");
  background-repeat: repeat-x;
  background-position: left center;
  color: black;
  width: 10px;
  height: 10px;
  line-height: 10px;

  font-family: OpenSymbolCropped;
  font-size: 21px;
  line-height: 9px;
  vertical-align: middle;
}

.hints-nav-item .checkbox-label {
  display: inline-block;
  vertical-align: middle;
}

.hints-nav-item .checkbox.off {
  color: transparent;
}


/* ------ CONTENT AREA ------ */

.friendlycode-panes {
  position: absolute;
  top: 30px;       /* corresponds to .friendlycode-toolbar.height */
  left: 0;
  right: 0;
  bottom: 0;    /* corresponds to 20 + footer.height */
}

div.editor-actions {
  visibility: visible;
  position: absolute;
  right: 20px;
  top: 20px;
}

.source-code {
  background-color: #F9F9F9;
  z-index: 1;
}

.source-code, .preview-holder {
  width: 50%;
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
  position: absolute;
  bottom: 0;
  top: 10px;
}

.preview-holder {
  right: 0;
  border-left: 1px solid #D6D6D6;
  background: white;
  background-color: #F9F9F9;
  padding: 10px;
}

.preview-holder iframe {
  border: 1px solid #D6D6D6;
  width: 100%;
  height: 100%;
  background-color: white;
}

.source-code .CodeMirror, .source-code .CodeMirror-scroll {
  height: 100%;
  overflow: auto;
}

.tipsy.friendlycode-base {
  /* Make tipsy tooltips slightly larger than the default. */
  font-size: 12px;
}

.friendlycode-base .breadcrumbs {
  position: relative;
  display: inline-block;
  width: 1px;
  height: 100%;
  margin: 0;
  border-right: 1px solid #848484;
}
.friendlycode-base .breadcrumbs:after,
.friendlycode-base .breadcrumbs:before {
  left: 100%;
  border: solid transparent;
  content: " ";
  height: 0;
  width: 0;
  position: absolute;
  pointer-events: none;
}
.friendlycode-base .breadcrumbs:after {
  border-left-color: #fff; 
  border-width: 5px;
  top: 50%;
  margin-top: -5px;
}
.friendlycode-base .breadcrumbs:before {
  border-left-color: #848484;
  border-width: 7px;
  top: 50%;
  margin-top: -7px;
}