body{ background:#efefef url("/img/bg.png") top center; cursor: default; } @media only screen and (-webkit-min-device-pixel-ratio: 1.5){ body{ background:#efefef url("/img/bg@2x.png") top center; background-size:10px 10px; } } #spinner{ height:100%; width:100%; position:fixed; z-index:1000; } .debug{ display:none; }