The First and Second Alternating colors are the settings used for posts, threads, forums, and many other places. You can find these by choosing Main CSS from the style dropdown.
If you want to only change the font in a specific place, I suggest adding markup to the templates. In the case of the posts, that's in postbit or postbit_legacy; in the case of the thread and forum listings, that's threadbit and forumhome_forumbit_level*_* .
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