body {
background-image: url('/path/to/image.png');
} @media (-webkit-min-device-pixel-ratio: 1.5), (min–moz-device-pixel-ratio: 1.5), (-o-min-device-pixel-ratio: 3/2), (min-resolution: 1.5dppx) {
body { background-image: url("/path/to/image@2x.png"); background-size: 200px 100px; }
} header {
background-image: url("/path/to/header.png");
} @media (-webkit-min-device-pixel-ratio: 1.5), (min–moz-device-pixel-ratio: 1.5), (-o-min-device-pixel-ratio: 3/2), (min-resolution: 1.5dppx) {
header { background-image: url("/path/to/header@2x.png"); background-size: 600px 50px; }
}