How to increase the width of the Book module's reading area (Moodle 1.9.15)

Peter Skoda (http://skodak.org) and Mojmir Volf are the authors of the Book resource. The Book resource is one of the major reasons why I love Moodle. It's a brilliant resource because it allows me to group related articles and webpages in a nice package. Something like the HTML frameset objects which were very common during the early days of HTML and the Internet. In short, I can't live without it. And neither can most of you Moodlers reading this I would reckon.

The challenge: 
Recently I was using the Book resource to encapsulate articles on http://www.sewwhatinc.com. I was doing this work as part of my teaching of MIS at Stamford College Malacca, specifically a case study on Sew What? Incorporated. So anyway, I discovered that I wanted to increase the width of the reading area of the Book resource. Why would I want to do that? I was embedding a Dell webpage into a book chapter and I found that

1. I couldn't view the embedded webpage's entire width within the book
2. the embedded content did not fit inside the right area of the book resource. The embedded website needed horizontal scroll bars (hmmm....) at the bottom of the display area in order for me to view the Dell site in its entirety.