JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

body {
  background:yellow;
}
div {
  width: 30px;
  height: 30px;
  padding: 10px;
  margin: 0 auto;
  border: solid 1px blue;
  border-radius: 50%;
  background: blue content-box;
}