Start adding style elements from the sample style sheet shown in Appendix A. Add one or two elements at a time, then save the style sheet. Repeat with additional elements from the sample style sheet, a few at a time. Experiment with different colors, fonts, margins, etc., if you wish. You don't need to save this file. Otherwise the HTML code is the same.
References There are many references on the Web and in print to style sheets.
Designing for the Web . Addison-Wesley, New York, 1997. This is the CSS bible by the guys who wrote the CSS1 specification. A good tutorial with many examples and explanations. Published April 1998.