JSFiddle - React, Tailwind, and code Playground

by j08691

HTML

<div class="sq"></div>

CSS

.sq{
    width: 50%;
    height: 0;
    padding-bottom: 50%;
    background: red;
    position:absolute;
    margin:auto;
    top:0;
    bottom:0;
    left:0;
    right:0;
}