tooltip.css

/**
 * Tooltip.js is a lightweight javascript plugin for responsive and
 * easy to use tooltips.
 *
 * @version   1.0
 * @author    Jakob Ploens <jakob@2helden.com>
 * @copyright Jakob Ploens 2016
 * @license   The MIT License
 */
/**
 * Settings
 *
 */
/**
 * Don't change following lines till line 42.
 * These are the most important ones.
 *
 */
.tooltip {
  opacity: 0;
  position: absolute;
  z-index: 10000;
}

.tooltip--fixed {
  position: fixed;
}

.tooltip--is-shown {
  opacity: 1;
}

/**
 * Here you go – our theme. Adjust like you want it to look like.
 */
.tooltip {
  background: #000;
  color: #fff;
  text-align: center;
  max-width: 30em;
  padding: 0.5em 1em;
  border-radius: 2px;
  -webkit-transition: opacity .1s;
  transition: opacity .1s;
}

/**
 * Defining the caret.
 */
.tooltip::after {
  content: '';
  position: absolute;
  left: 50%;
  width: 0;
  height: 0;
  border-left: 0.5em solid transparent;
  border-right: 0.5em solid transparent;
  border-top: 0.5em solid #000;
  margin-left: -0.5em;
  bottom: -0.5em;
}

.tooltip--bottom::after {
  border-top: none;
  border-bottom: 0.5em solid #000;
  top: -0.5em;
  bottom: auto;
}

.tooltip--left {
  margin-left: -1.25em;
}

.tooltip--left::after {
  left: 1.25em;
  margin: 0;
}

.tooltip--right::after {
  right: 1.25em;
  margin: 0;
  left: auto;
}