Amazon: Added -webkit-text-size-adjust. Fixes #214.

The text in the details becomes too big on iOS devices. Adding `-webkit-text-size-adjust: 100%` seems to fix that.

@moollaza @nospampleasemam please test on Firefox on Android--we might need `-moz-text-size-adjust`

References:
http://stackoverflow.com/questions/6210788/how-to-avoid-ios-automatic-font-size-adjustment