This is based off of "Dark CNN Improved", but it needed a lot of work to bang it into shape for the current CNN websites. I use AdBlock Plus, so there may be things I'm not seeing which I have not adjusted for (seemed fine when I turned off ABP, though). At the worst, it's a decent starting point, though.

The sub-links under the main link under the primary story are not changeable at this time by any rules I know. This is because CNN is daft enough to slam a span inside an anchor, and the static span rule is overriding the anchor rule. I don't see anything for it. Same thing for those inStoryHeader spans in pages; you can't assume they're all links, as there are actually headers which have the same class.