JSFiddle - React, Tailwind, and code Playground

HTML

<html>
    <body>
        body
        <div>
            Div
        </div>
    </body>
</html>

CSS

html {
    height: 100%;
    background-color: yellow;
    padding: 10px;
}

body {
    height: 100%;
    background-color: red;
    padding: 10px;
}

div {
    height: 100%;
    background-color: blue;
    padding: 10px;
}