JSFiddle - React, Tailwind, and code Playground

by iii l

HTML

<div class="wrap">
    <div class="child"></div>
</div>

CSS

.wrap {
    width:500px;
    margin: 0 auto;
    height:400px;
    background:red;
}
.child {
    background:green;
    height:50px;
    position:absolute;
    left:0;
    width:100%;
    margin-top:200px;
}