SOURCE

<div class="box">
	<div class="img-box">
		<img src='https://1588292574.rsc.cdn77.org/photo/7f1ad4bba83b02a97e8740f2ff7e03ae-0-view.jpg'/>
	</div>
</div>

.box{
	width:500px
}
.img-box{
	width:100%;
	position:relative;
	padding-top:100%;
}
img{
	position:absolute;
	top:0;
	width:100%;
	bottom:0;
}