html {
background-image: url("logo.gif");
background-repeat: no-repeat;
background-attachment: fixed;
background-position: 50% 50%;
background-color: #CCC;
}

@media only screen and (-webkit-min-device-pixel-ratio: 2),(-webkit-min-device-pixel-ratio: 1.5) {
	html {
		background-image :url("logo@2x.gif");
		background-repeat: no-repeat;
		background-attachment: fixed;
		background-position: 50% 50%;
    background-size: 36%;
	}
}

body {display: none;}