JSFiddle - React, Tailwind, and code Playground

by kuonyuu

HTML

<div></div>

CSS

div
{
    background-color: #ccc;
    width: 100%;
    height: 0;
    padding-bottom: 100%;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}