JSFiddle - React, Tailwind, and code Playground

HTML

<section>
	<div></div>
	<div></div>
</section>

CSS

html, body {height: 100%;margin: 0;}
section {overflow:hidden;height:100%;}
div:first-child {float:left;width:200px;height:100%;background:#009757;}
div:first-child+div {overflow:hidden;height:100%;background:#CC3333;}