@media (-webkit-min-device-pixel-ratio: 2),
       (-o-min-device-pixel-ratio: 2/1),
       (min-resolution: 2dppx),
       (min-resolution: 192dpi) { }

@media (-webkit-min-device-pixel-ratio: 2.5), (-o-min-device-pixel-ratio: 5/2), (min-resolution: 2.5dppx) { }

@media (-webkit-min-device-pixel-ratio: 1.5), (-o-min-device-pixel-ratio: 3/2), (min-resolution: 144dpi) { }
