JSFiddle - React, Tailwind, and code Playground

HTML

<div id="yellow">
    <div id="red">
        <div id="blue">
        </div>
    </div>
</div>

CSS

div {
    height: 100%;
    padding: 10px;
}

#yellow {
    background-color: yellow;
}

#red {
    background-color: red;
}

#blue {
    background-color: blue;
}