JSFiddle - React, Tailwind, and code Playground

HTML

<div id="circle"><div>

CSS

#circle 
{
    width: 100px;
    height: 100px;
    background: #999;    
    border: 2px solid red; 
    border-radius: 100px;       
    box-shadow: 0 10px 10px #000 inset;
}