text width

[chipbrock]

I love Ed and have written 1/3 of a book for a physics class in it in 10 chapters (files) so far. I appreciate everything about it but I cannot figure out how to do one simple thing:

I would like to make the body text width in the presentation a little bit wider.

I've played a bit but cannot fine an easy way to to this and would appreciate a hint!

thanks
Ray