When you start doing this sort of changing of letter size, etc, be sure to keep an eye on how it will look in your target device. Some css can unexpectedly cause text to disappear by being shoved off the right side of screen.
You might take a look at Three Men in a Boat, which is available in the MR library. It is full of fancy formatting that works. Glance through it in Book View and when you see something that you like, switch to Code View and see how it is done.