JSFiddle - React, Tailwind, and code Playground

HTML

<section>
	<div></div><!--
 --><div></div>
</section>

CSS

html, body {height: 100%;margin: 0;}
section {height:100%;}
div {display:inline-block;vertical-align:top;height:100%;}
div:first-child {width:200px;background:#009757;}
div:first-child+div {
    width: -moz-calc(100% - 200px);
    width: -webkit-calc(100% - 200px);
    width: calc(100% - 200px);
    background:#CC3333;
}