JSFiddle - React, Tailwind, and code Playground

HTML

<div id="parent">
        <div id="child">
        </div>
    </div>

CSS

#parent
{
    position: absolute;
    width: 100px;
    height: 100px;
    background: blue;
}

#child
{
    position: absolute;
    z-index: -1;
    width: 50px;
    height: 50px;
    top: 25px;
    left: 25px;
    background: red;
}