CSS stands for Cascading Style Sheets: a very powerful definition language for document ´style´ Style is considered to be averything apart from the content of a document - including such things as margins, colour, font, text-size, etc...

A complete description and discussion on CSS is well beyond the scope of this topic - instead, some of the basics, to assist in entering style information into the various modules that call for it will be covered.

For a mode definitive discussion about CSS see:
http://www.w3.org/Style/CSS/