JSFiddle - React, Tailwind, and code Playground

HTML

<div id="top">
</div>

<div id="middle">
    <div id="innerMiddle">
    </div>
</div>

CSS

#top {
    width: 100%;
    height: 100px;
    box-shadow: 3px 3px 3px #333;
    background-color: blue;
}

#middle {
    width: 100%;
    height: 200px;
    z-index: 0;
    position: relative;
    background-color: orange;
}

#innerMiddle {
    width: 200px;
    height: 200px;
    margin: 0 auto;
    background-color: green;
}