JSFiddle - React, Tailwind, and code Playground

HTML

<div>

</div>



<div>

</div>

CSS

div {
  position: relative;
  width:300px;
  height: 200px;
  background: black;
}

div:nth-child(2) {
  margin-top: 70px;
  height: 100px;
  width: 150px;
}

div:after {
  content: "";
  position: absolute;
  top: 20px;
  left: 20px;
  background: linear-gradient(90.04deg, orange 11.28%, yellow 87.74%);
  z-index: -1;
  width: 100%; /* LOL */
  height: 100%; /* LOL */
}