JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
  position:relative;
  width : 30px;
  height : 30px;
  margin : 0 auto;
  border-radius: 50%;
  border: 1px solid red;
}
div:before {
  position :absolute;
	width: 20px;
	height: 20px;
  left: 5px;
  top: 5px;
  background-color:blue;
  border-radius: 50%;
	content: "";
}