JSFiddle - React, Tailwind, and code Playground

HTML

<div id="div_one"></div>
<div id="div_two"></div>

CSS

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

#div_one{
  height:50%;
  width:100%;
  background:#f00;
}

#div_two{
  height:50%;
  width:100%;
  background:#00f;
}