I\'m having a problem with the back face-visibilty property. It works how I want it to in Safari/Chrome, but for some reason it\'s not working correctly in Firefox.
This bug has been acknowledged by Mozilla.
The fix is to add transform: rotateX(0deg) to the front and back objects.
transform: rotateX(0deg)
Adding backface-visiblity:hidden on the container, as suggested by @yalia, makes the back unresponsive in Chrome, hence that fix should be avoided.
backface-visiblity:hidden
Here's a fiddle with the fix.