Changing default theme font

Hi – I’m using a custom theme from fabthemes.com on my site (soundbitesandseasonings.com). As you can see, the font in the main menu, the date on the image slider, and ‘recent posts’ in the right widget are all a default, Arial-esque font. I have a Google Fonts plugin that changed <p> and header fonts, but I can’t seem to tweak my style.css to override that default font.

Will someone please look at my code and help me fix this? Thanks so much in advance!!