Please, add support for background images on Q/A cards.

[DanielKonopka]

I have tried to achieve this through <table>, <div> and <span> + some CSS, but the two first seem not being supported at all, and the latter seems to only support very basic CSS styling (background-color works, but not background-image, etc). I'm not an Android developer, I have no idea how complex would this feature be to implement. I would so love to be able to use a torn paper background image for my cards, though.