JSFiddle - React, Tailwind, and code Playground

HTML

<button>foo</button>
<div>foo</div>

CSS

body * {
    width: 20px;
    height: 20px;
    background: orange;
    border: 1px solid black;
    display: block;
    overflow: hidden;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}
body *:before {
    content: "";
    height: 150%;
    width: 0;
    display: block;
}