JSFiddle - React, Tailwind, and code Playground

HTML

<div></div>

CSS

div {
    border: 1px solid #333;
    margin: 50px;
    width: 400px;
    height: 200px;
    box-shadow: 
        inset 0 80px 60px -60px rgba(21, 21, 21, 0.57), 
        inset 0 -80px 60px -60px rgba(21, 21, 21, 0.57);
}