Thanks, but still unclear. I might need this really spelled out for me! I assume this is meant for CSS rather than html? I suggest you get some more familiarity with the basics of HTML and CSS, to be able to better understand whats going on. If you had trouble with reading the code of that half-done, but simple example, you will have trouble learning from more complicated examples or by looking at existing sheet code. Anyway, I updated the section to make it more clear for the future.