SASS: Retina images

SASS: Retina images

/*--------------------------------
	Retina images
	example:
	.element {
		@include retina {
			background-image: url(../img/background@2x.png);
		}
	}
*/

@mixin retina {
	@media only screen and (-webkit-min-device-pixel-ratio: 1.5),
	only screen and (-moz-min-device-pixel-ratio: 1.5),
	only screen and (-o-min-device-pixel-ratio: 3 / 2),
	only screen and (min-device-pixel-ratio: 1.5),
	only screen and (min-resolution: 1.5dppx) {
		@content;
	}
}