JSFiddle - React, Tailwind, and code Playground

HTML

<div class="rounded"></div>

CSS

.rounded {
    display: inline-block;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    -ms-border-radius: 50%;
    border-radius: 50%;
    border: 3px solid #fff;
    background: #f00;
    width: 100px;
    height: 100px;
}

body {
    background-color: #fff;
}