JSFiddle - React, Tailwind, and code Playground

HTML

<div class="copy"></div>

CSS

.copy {
  margin: 0 auto;
  background: red;
  height: 50px;
  width: 115px;
}
.copy:before {
  content: " ";
  width: 200px;
  height: 50px;
  background: blue;
  position:absolute;
  top:58px;
  display:none;
}
.copy:hover:before {
    display:block;
}