JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <aside id="sidebar">Links and whatnot</aside>
    <section id="content">Content and whatnot</section>
</div>

CSS

html, body {
    width: 100%;
    height: 100%;
}

div#container {
    height: 100%;
}

aside#sidebar {
    background-color: #f00;
    width: 205px;
    min-height: 100%;
    float: left;
}

section#content {
    background-color: #0f0;
    min-height: 100%;
}