@mixin retina {
	@media only screen and (-webkit-min-device-pixel-ratio: 2),
		only screen and (min--moz-device-pixel-ratio: 2),
		only screen and (min-device-pixel-ratio: 2),
		only screen and (-webkit-min-device-pixel-ratio: 2),
		only screen and (min-resolution: 192dpi),
		only screen and (min-resolution: 2dppx) {
		@content;
	}
}