[Kerrick]

Fun fact: your text will look nothing like a book if you use HTML with no CSS and rely only on the user agent default style sheet.

Books are designed, too.

[GoblinSlayer]

If you don't like default settings, change them, that's why the options dialog exists.

[Kerrick]

Couldn’t you say that CSS is like a really powerful options dialog?

[calsy]

substantial styling enhancements.