JSFiddle - React, Tailwind, and code Playground

HTML

<div id=shadow></div>

CSS

#shadow {
    border-radius: 50%;
    width: 100px;
    height: 100px;
    background: black;
    opacity: 0.5;
    -webkit-filter: blur(10px);
    -webkit-transform: scale(1, 0.2);
}