Brilliant about the margins, thanks!
I should have thought of it myself instead of relying on the margins disappearing by themselves...
My excuse is that I thought the svg script took care of it (I don't even know what svg is

) and that I have been looking at this specific epub for too long now... Maybe I need to clear my head a little.
Anyway, cover now looks beautiful, but is still on page 2-3 on the reader, and on Adobe Digital Editions it was page 2, then after some scrolling up and down it is on page 3! Nothing before it of course, it just refuses to be on the first page... On the reader I specifically ask "go to page 1" and it displays page 2-3 instead.