JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<header>

<div id="title">
Just a title
</div>

</header>

<main>
Main div element here
</main>

</body>

CSS

html, body{
    background-color:#A8F000;
    height:100%;
    }

header{
    background-color:#F80012;
    height:20%;
    }

main{
    background-color:#009E8E;
    height:80%;
    }