Mobile-specific styles

@media screen and (orientation:portrait) { }

@media screen and (orientation:landscape) { }

Smart phones

@media only screen and (min-device-width : 320px) and (max-device-width : 480px) { }

iPad

@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) { }

iPhone 4/5

@media only screen and (-webkit-min-device-pixel-ratio : 1.5), only screen and (min-device-pixel-ratio : 1.5) { }