CSS stands for C ascading S tyle S heet. This code is usually referenced by your blog as a standalone document, so the formating becomes a modular add-on to the rest of the page.
The purpose of this code is to redefine how certain portions of you blog will look. For instance, the question box on this site has a yellow background with an orange title-bar and red lettering on the heading. This is handled in the stylesheet. The HTML code for this page only had to say that there was a question area and a heading within that question area; the stylesheet formatted it.
The usefulness lies in changing your format quickly, as a stylesheet on this page would produce the exact same content (HTML would not change); but it could, perhaps have a green background with blue headings in the question area.
You may try to recycle another stylesheet from someone else, if you see a look that you like. Get permission first, though.
If you really want to get into writing CSS,
http://w3schools.com is of great help, as is the book,
HTML, XHTML & CSS, (ISBN 0–321-43084–0).
Worked great to teach me. Book goes over a lot of material rather quickly. It has many examples, which helped me learn this very quickly.
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