JSFiddle - React, Tailwind, and code Playground

HTML

<header>
    <h1></h1>
</header>
<div>
s
</div>

CSS

* {
    padding:0;
    margin:0;
}
html, body {
    height:100%;
}
header {
    width:100%;
    background:#d0d0d0;
    height:100%;
}
h1 {
    display:block;
    border:#000 solid 1px;
    margin:0 50px 0 0;
    height:50%;
}
div{
  float: right;
    background:#;
}