JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<div class="row">
	<div class="col-md-2">
		<img src="http://lorempixel.com/400/300/" alt="" />
	</div>
	<div class="col-md-2">
		<img src="http://lorempixel.com/200/400/" alt="" />
	</div>
	<div class="col-md-2">
		<img src="http://lorempixel.com/500/250/" alt="" />
	</div>
	<div class="col-md-2">
		<img src="http://lorempixel.com/250/400/" alt="" />
	</div>
</div>

CSS

img {
    max-width: 100%;
}