JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
	<div class="leftpage">
    	<p>Left content</p>
    </div>
    
    <div class="rightpage">
    	<p>Right content</p>
    </div>
</div>

CSS

div.container {
	display: table;
	width: 100%;
}

div.leftpage, div.rightpage {
	display: table-cell;
	height: 200px;
}

div.leftpage {
	background-color: #ddd;
	width: 200px;
}

div.rightpage {
	background-color: #aaa;
}