Flicker issue on OS X

[gitjamd]

So, I think that this may have something to do with the code behind the card type. When studying cards, there are momentary flashes of the Original Image just before the Question overlay is displayed. Maybe there is a way to display the Question and then the Original Image BEHIND it? I think that would solve the flickering problem on OS X.

I understand what you were trying to do with the "z-index" usage; that fix would work great if the Question and Original image displayed simultaneously. It doesn't look like they are.

Tiago, I want to thank you for putting so much work into this add-on. Hope to hear from you about this issue.