JSFiddle - React, Tailwind, and code Playground

HTML

<div id="tv">
  <div id="square">

  </div>
</div>

CSS

#square {
   width: 200px;
   height: 180px;
   background: red;
 }
 
 #tv {
   position: relative;
   margin-top: 100px;
   width: 200px;
   height: 200px;
   margin: 20px 0;
   background: red;
   border-radius: 100px / 20px;
 }