JSFiddle - React, Tailwind, and code Playground

HTML

<div id="parent"> parent
    <div id="child">
        I am a child DIV. But I have more content.
    </div>
</div>

CSS

* {
    margin: 0;
    padding: 0;
    color: white;
    box-sizing: border-box;
}
#parent {
    background-color: teal;
    overflow: hidden;
    display: inline-block;
}
#child {
    border: 1px solid yellow;
    margin: 20%;
}