JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">

	<div id="menu">
    foo
	</div>
	
	<div id="content">
    foo
	</div>

</div>

CSS

#container { width:100%; }
#menu { background:red; display:inline-block; width:200px; }
#content { background:yellow; display:inline-block; }