Tooltip

a {
  border-bottom: 1px solid #bbb;
  color: #666;
  display: inline- block;
  position: relative;
  text-decoration: none;
}
a:hover,
a:focus {
  color: #36c;
}
a:active {
  top: 1px;
} /* Tooltip styling */
a[data-tooltip]:after {
  border-top: 8px solid #222;
  border-top: 8px solid hsla(0, 0%, 0%, . 85);
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  content: "";
  display: none;
  height: 0;
  width: 0;
  left: 25%;
  position: absolute;
}
a[data-tooltip]:before {
  background: #222;
  background: hsla(0, 0%, 0%, . 85);
  color: #f6f6f6;
  content: attr (data-tooltip);
  display: none;
  font-family: sans-serif;
  font-size: 14px;
  height: 32px;
  left: 0;
  line-height: 32px;
  padding: 0 15px;
  position: absolute;
  text-shadow: 0 1px 1px hsla(0, 0%, 0%, 1);
  white-space: nowrap;
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  -o-border-radius: 5px;
  border-radius: 5px;
}
a[data-tooltip]:hover:after {
  display: block;
  top: -9px;
}
a[data-tooltip]:hover:before {
  display: block;
  top: -41px;
}
a[data-tooltip]:active:after {
  top: -10px;
}
a[data-tooltip]:active:before {
  top: -42px;
}