[GeoffR]

Originally Posted by scoky

Thanks! However, actually I want to increase the top margin.....

Well that is a nice change :-) Editing the book's stylesheet the way jackie_w suggests is probably the best way to go, that is what I do.

However I do have a patch for the epub reader's built-in stylesheet if anyone wants to try it. Although it has the advantage that the books don't need to be edited and sideloaded again, it has the disadvantage that the page margin set in the built-in stylesheet overrides any page margin set in the book, which means the book can't use a smaller margin. (Some books use a zero margin for the cover page, for example).

Here is the patch for firmware 3.2.0.

Spoiler:

<Patch>
# Apply this version of the patch with kpg.exe
patch_name = `ePub stylesheet additions (page margin example)`
patch_enable = `yes`
replace_xor_00 = 1181FAA, `\x00\x00watchout, your CSS is about to get truncated!\x00\x00\x00`, `\n@page {margin: 25px 0px 0px 0px}\n\x00`
</Patch>

<Patch>
# Apply this version of the patch with patch32lsb
patch_name = `ePub stylesheet additions (page margin example)`
patch_enable = `yes`
replace_string = 1181FAA, `\x00\x00watchout, your CSS is about to get truncated!\x00\x00`, `\n@page {margin: 25px 0px 0px 0px}\n`
</Patch>

Edit: I have been looking into a way to make the top margin adjustable, i.e. so that when you adjust the left/right margins the top margin changes to match. I think it is possible to do it, and if I had the source code I think I could add this feature in 5 minutes, but it is an awful lot more work to do it with a patch :-(