leostratus

@media only screen and (-webkit-min-device-pixel-ratio: 1.5),
only screen and (min--moz-device-pixel-ratio: 1.5),
only screen and (-o-device-pixel-ratio: 3/2), 
only screen and (min-device-pixel-ratio: 1.5) {
    /* High-res version of image assets go here */
}