JSFiddle - React, Tailwind, and code Playground

HTML

<div>2</div>

CSS

div {
    background: linear-gradient(to top, #aaa, #ddd);
    color: #fff;
    font: bold 1.5em/1 sans-serif;
    width: 1em;
    padding: .5em;
    text-align: center;
    border-radius: 50%;
    text-shadow: 0 -1px 1px rgba(0,0,0,.5);
}