JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="inner">hi</div>
</div>

CSS

.container {
  background: red;
  position: relative;
  width: 400px;
  height: 300px;
}

.inner {
  background: blue;
  position: absolute;
  top: 0;
  left: 200px;
  bottom: 0;
  right: 0;
}