JSFiddle - React, Tailwind, and code Playground

by Thadeusz

HTML

<div>

</div>

CSS

div {
  height: 30px;
  width: 40px;
  border: 50px solid black;
  border-image: radial-gradient(circle at 20px 30px, green 20px, rgba(0, 0, 255, .5) 20px);
}