JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outside">
  <div class="inside">

  </div>
</div>

CSS

.outside {
  border: 5px solid pink;
  background: #888;
  border-radius: 50px;
  /* overflow: hidden; */
}

.inside {
  background: lightblue;
  height: 50px;
}