[Fahi]

I think you are running into limitations of the QT webengine.

After spending a few hours on that, I was wondering if the problem wasn't something like that :P
Finally i took your background image, which is great too. I just modified it a little to simulate a book that suits me better. I put also the croped background i wanted to use initially.

And i use this css

body{
 margin-top: 0.15em !important;
}

p{
 margin-bottom: 0.3em !important; 
 margin-left:   6.5em !important;
 margin-right:  6.5em !important;
}

h2,h3,h4,h5,h6{
 margin-left: 4.5em !important;
}

I'm still interested if someone find a solution to put a space at the top and bottom of pages.

I hope in a future update we can deal with the body margin, that would solve all these problems Anyway thanks for this great software and thank you Doc for your time responding to me.