Resizing but keep aspect ratio

img.some_class {
	display: block;
	max-width: 604px;
	max-height: 270px;
	width: auto;
	height: auto;

This also works well:

.some_class img {
	display: block;
	max-width: 100%;
	max-height: 162px;
	height: auto;

Background Image To Fill DIV

Useful for double size images for retina displays, responsive div boxes etc

.top_header_logo {
	background-image: url(;
	background-repeat: no-repeat;
	background-position: center top;
	background-size: cover;    /*Make image fill the div*/
	height: 180px;
	width: 210px;	


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