JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="left"></div>
  <div class="right"></div>
</div>

CSS

html, body {
  height: 100%;
  margin: 0;
}
.container {
  display: table;
  width: 100%;
  height: 100%;
}
.left, .right {
  display: table-cell;
  width: 50%;
}
.right {
  background: grey;
}