JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
    width: 30px;
    height: 30px;
    background-color: black;
    box-shadow: 0 0 15px 20px #000, 0 0 15px 20px #000 inset;
    border: 10px solid #000 ;
    border-radius: 150px;
}