JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <img src="http://www.txbl.net/wp-content/themes/default/custom/rotator/home-4.jpg" />
    <div class="gray"></div>
</div>

CSS

.container {
    width: 425px;
    height: 320px;
    position: relative;
}

.container img {
    z-index: 20;
}

.container .gray {
    width: 420px;
    height: 315px;
    position: absolute;
    margin-left: 5px;
    margin-top: -315px;
    z-index: 10;
    background-color: gray;
}