So, for 560 today we introduced the concept and basic notions behind CSS. The basic idea is that you want to separate the style layer from the structure layer. Doing so allows you to replace style without modifying structure. A GREAT site that demonstrates this is CSSzengarden.com. The principle concepts that you need to understand for CSS are:
- selectors, classes and IDs
- the Box model
Here’s a file you can download to practice CSS with (if you don’t have your own).