JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="content">Text...</div>
</div>

CSS

.container {
  border: 1px solid black;
  border-radius: 10px;
  overflow: hidden;
}

.content {
  background: blue;
  color: #fff;
  padding: 10px;
}