JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://necolas.github.io/normalize.css/3.0.1/normalize.css">
<div class="box1">
    div
</div>

CSS

.box1 {
    width: 100%;
    height: 50%;
    background-color: rgb(0, 244, 85);
}