JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
  font-size: 1em;

  position: relative;

  width: 30px;
  height: 30px;
  margin: 0 auto;

  border-radius: 50%;
  background-color: blue;
  box-shadow: 0 0 0 .3em white, 0 0 0 .35em red;
}