JSFiddle - React, Tailwind, and code Playground

by Qwerty_Wasd

HTML

<div class="test"></div>

CSS

html {
	border: 1px solid red;
}
body {
	border: 1px solid blue;
}
.test {
	position: absolute;
	top: 10%;
	left: 10%;
	height: 50px;
	width: 50px;
	background: black;
}

JavaScript

//alert(getComputedStyle(document.documentElement).height);