Hi Sharon,
I found it!!! :D
on the server in the "mod" -> "Book" folder, there is a file called "styles.php"
In that file I edited the ".book_content" class by adding "font-size:smaller;"
That did the trick for me, although as far as the fuzzy images are concerned, I'm sorry to say that I don't know how to address that issue.
Book
book module makes my images blurry and fonts bigger
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