JSFiddle - React, Tailwind, and code Playground

HTML

<article id="content">
<p>Hello, World!</p>
</article>
<nav id="sidenav"><ul>
    <li>nav</li>
    <li>nav</li>
    <li>nav</li>
</ul></nav>

CSS

#sidenav {
    position:absolute;
    top:0; left:0; width:150px; height:200px;
    background:red;
}
#content {
    height:600px;
    margin-left:150px;
    background:url(http://phrogz.net/tmp/gkhead.jpg) no-repeat;
    background-size:100% auto;
}