This is a much cleaner and clearer css file than my annotated_css1, and should be a lot easier to follow. The most recently updated (2.03.1) has improved annotation.
It should allow relative newcomers to css to make basic changes to the default theme in just a few minutes.
Can't seem to delete the first screenshot. The second is how the most recent theme looks. The third is how it looks on my website.
Works on Vanilla 188.8.131.52