Because not all plugins/widgets are written using the same naming conventions, there isn't a global fix for this. What you can do is look at the generated source of the page or use FireBug with Firefox, and find the widget title. Looking at the code, you should be able to construct a CSS Selector and CSS rules to apply the styling you want and put that in the 'CSS Inserts' option.
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Juggledad | Forum Moderator/Support