JSFiddle - React, Tailwind, and code Playground

HTML

<br>

<p>We love using <a href="http://geni.us/sea-salt" data-tool="Buy on Amazon" class="tooltip animate">pink himalayan sea salt</a> for all sorts of dishes.</p>

CSS

a.tooltip{
  position: relative;
  display: inline;
}
a.tooltip:after{
  display: block;
  visibility: hidden;
  position: absolute;
  bottom: 0;
  left: 20%;
  opacity: 0;
  content: attr(data-tool); /* might also use attr(title) */
  height: auto;
  min-width: 150px;
  padding: 5px 5px;
  z-index: 999;
  color: #fff;
  text-decoration: none;
  text-align: center;
  background: rgba(0,0,0,0.85);
  -webkit-border-radius: 5px;
  -moz-border-radius: 5px;
  border-radius: 5px;
}
 
a.tooltip:before {
  position: absolute;
  visibility: hidden;
  width: 0;
  height: 0;
  left: 50%;
  bottom: 0px;
  opacity: 0;
  content: "";
  border-style: solid;
  border-width: 6px 6px 0 6px;
  border-color: rgba(0,0,0,0.85) transparent transparent transparent;
}
a.tooltip:hover:after{ visibility: visible; opacity: 1; bottom: 20px; }
a.tooltip:hover:before{ visibility: visible; opacity: 1; bottom: 14px; }

a.tooltip.animate:after, a.tooltip.animate:before {
  -webkit-transition: all 0.2s ease-in-out;
  -moz-transition: all 0.2s ease-in-out;
  -ms-transition: all 0.2s ease-in-out;
  -o-transition: all 0.2s ease-in-out;
  transition: all 0.2s ease-in-out;
}