CSS: Media Queries for Standard Devices (http://css-tricks.com/snippets/css/media-queries-for-standard-devices/)

gistfile1.css

/* Smartphones (portrait and landscape) ----------- */
@media only screen 
and (min-device-width: 320px) 
and (max-device-width: 480px) {
}

/* Smartphones (landscape) ----------- */
@media only screen 
and (min-width: 321px) {
}

/* Smartphones (portrait) ----------- */
@media only screen 
and (max-width: 320px) {
}

/* iPads (portrait and landscape) ----------- */
@media only screen 
and (min-device-width: 768px) 
and (max-device-width: 1024px) {
}

/* iPads (landscape) ----------- */
@media only screen 
and (min-device-width: 768px) 
and (max-device-width: 1024px) 
and (orientation: landscape) {
}

/* iPads (portrait) ----------- */
@media only screen 
and (min-device-width: 768px) 
and (max-device-width: 1024px) 
and (orientation: portrait) {
}

/* Desktops and laptops ----------- */
@media only screen 
and (min-width: 1224px) {
}

/* Large screens ----------- */
@media only screen 
and (min-width: 1824px) {
}

/* iPhone 4 ----------- */
@media
only screen and (-webkit-min-device-pixel-ratio: 1.5),
only screen and (min-device-pixel-ratio: 1.5) {
}