JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <ul>
    <li></li>
  </ul>
</div>

CSS

div {
  position: relative;
  height: 200px;
  width: 200px;
  background-color: red;
}

ul {
  position: absolute;
  top: 20px;
  left: 50px;
  height: 300px;
  width: 400px;
  background-color: green;
  z-index: 200;
}