JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper"></div>

CSS

html {
    height:100%;
}
body {
    min-height: 100%;
    margin: 0; padding: 0;
}
#wrapper {
    position: absolute; top: 0; bottom: 0;
    width: 50%;
    background:cyan;
}