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Although there (still?) is a setting in the preferences to change the font of a viewpart's title, the font is anything but what you define. Additionally on my system the font is massive, so I can't even live with the standard font - see the attachment. I tried with the Juno Milestones 1 & 2.
Created attachment 203682 [details] screenshot of the problem
Changing the CSS value should solve your problem. Please see bug 344234 comment 4. *** This bug has been marked as a duplicate of bug 344234 ***