Mobile website. viewport width gets stuck going back to portrait
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=2.0, minimum-scale=1.0, user-scalable=1" />

@media all and (device-width: 320) and (orientation: portrait) { ... }
@media all and (device-width: 480) and (orientation: landscape) { ... }