JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content"></div>

CSS

#content {
	width: 100px;
	height: 100px;
	background-color: #999999;
	position: absolute;
	left: 10px;
	top: 10px;
	box-shadow: inset -15px 0 15px -15px;
}

/* How would I put the same Box-Shadow on the left side as well? */