Wer über CSS (cascading stylesheets) mehr wissen will.
http://www.w3schools.com/css/
http://www.w3.org/Style/CSS/
http://www.w3.org/TR/REC-CSS2/
http://www.w3schools.com/css/
http://www.w3.org/Style/CSS/
http://www.w3.org/TR/REC-CSS2/