Originally Posted by DoctorOhh
Toggle the scroll icon to enter Paged mode. Now you will get a top and bottom margin that you can easily control via viewer preferences.
Ok, but in eBook viewer's prefrences, I don't find any option for that...
even so thanks for your answer.
EDIT: I would be better to apply 'user stylesheet' to a div cantaining all the page instead of body.
The scenario for displaying text would be the same, but we can apply a margin before displaying this div in the body.
But perhaps, it's not possible...