JSFiddle - React, Tailwind, and code Playground

HTML

<div class="itemimg"> <img src="http://blog.saijogeorge.com/wp-content/uploads/2013/12/Grunge-Superhero-Wallpaper.png" /> </div>
<div class="itemimg"> <img src="http://fc07.deviantart.net/fs70/f/2014/124/1/3/pokemon_blue_ios___android_wallpaper_by_nelsinios-d7h2dhk.png" /> </div>
<div class="itemimg"> <img src="https://lh3.googleusercontent.com/-hFl2PcPyKdw/TXK0VBkQrnI/AAAAAAAAD_w/-a_M9ih-Ess/s400/Best-top-desktop-beautiful-wolfs-wallpapers-hd-wolf-wallpaper-pictures-images-photos-8.jpeg" /> </div>

CSS

.itemimg {
	width: 400px;
	height: 400px;
	border: 1px solid;
	text-align: center;
	float: left;
	margin: 20px;
	position: relative;
	background:#CCC;
}
.itemimg img {
	bottom: 0;
	left: 0;
	margin: auto;
	max-height: 100%;
	max-width: 100%;
	position: absolute;
	right: 0;
	top: 0;
}