JSFiddle - React, Tailwind, and code Playground

by nju33

HTML

<div class="a"><div class="b"></div></div>

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

CSS

.a {
    border-radius: 50%;
    width: 5em;
    height: 5em;
    overflow: hidden;
    position: relative;
}

.b {
    width: 5em;
    height: 5em;
    background-color: #000;
    position: absolute;
}

.test {
    background-color: #000;
    border-radius: 1em;
    width: 10em;
    height: 10em;
}