Standard Media Queries

query.css

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

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

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

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

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

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

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

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

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

Test URLs

Canvas: http://apps.facebook.com/wf-polls/pages/cb4abc1ff159d6550265a79e36f66e73
Microsite: https://apps.wildfireapp.com/microsite/pages/cb4abc1ff159d6550265a79e36f66e73
Fan Page: https://www.facebook.com/pages/Generic-T/302915683055517?sk=app_160731467314127
Mobile: https://apps.wildfireapp.com/fbmobile/5/pages/cb4abc1ff159d6550265a79e36f66e73

wf_query.css

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

/* Smartphones (landscape) ----------- */
@media only screen
and (min-width : 321px)
and (max-width : 480px) {
/* Styles */
}

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

/* Desktop Only ----------- */
@media only screen
and (min-width : 481px) {
/* Styles */
}

/* FB Canvas ----------- */
@media only screen
and (min-width : 760px)
and (max-width : 760px) {
/* Styles */
}

/* FB Fan Page ----------- */
@media only screen
and (min-width : 810px)
and (max-width : 810px) {
/* Styles */
}