hmm ive never used opera, but i tested a page on it once... it didnt recognize ANY of the css... it must really hate css lol.
anyway, im pretty sure u need some "measuring value" or w/e (like pt, px, em, those things) after the number, so as others said before, try margin: 0px; padding: 0px;
PS: @Jim
u forgot the colon after padding
