JSFiddle - React, Tailwind, and code Playground

HTML

<header>
    1
</header>
<div>
    2
</div>
<footer>
    3
</footer>

CSS

header {
    background: red;
    height: 70px;
}

footer {
    background: blue;
    height: 80px;
}

div {
    background: gray;
}
}