JSFiddle - React, Tailwind, and code Playground

HTML

<div id="header"></div>

<div id="content"></div>

CSS

html, body {margin: 0; padding: 0; height: 100%;}

#header {width: 100%; height: 100px; background-color: #333;}

#content {position: relative; top: 10px; width: 100%; /*height: auto !important;*/  min-height: 100%; background-color: #999; }