JSFiddle - React, Tailwind, and code Playground

HTML

<div class="shadow">
        
            <!-- ANY CONTENT GOES HERE -->
            <div>
                <h1>Content</h1>
            </div>
            <!-- ANY CONTENT GOES HERE -->
        
        </div>

CSS

.shadow {
	position: absolute;
	width: 100%;
	height: 100%;
	-webkit-box-shadow: inset 0px 0px 400px #000000;
	box-shadow: inset 0px 0px 400px #000000;
}