I'm writing a book in word 2011 for mac, and I want to send it in PDF format to friends to proof read. I want it to open in their ibooks which is nice to use, I've set up a template that uses a 8x5 layout instead of A4 etc to make it more easily read on a small screen. When I convert it to PDF it sticks it in the middle of the page with huge white borders all the way round. Any idea of a simple way to achieve this?