Comic ePub without margin

How can i use this software to produce comic book in ePub format?

I have many JPG/PNG which are series of comic pages, one JPG/PNG represent one page. I can insert the images to the page one by one, but there is a default margin in each page.

How can i get rid of the margin when i want to compile as ePub format? Is that possible to do with this software? thank you.