Horzintal Inline Drop Down Menu - so close yet so far

I am trying to work on the layout of the sub menu / horizontal dropdown menu on the site below (hover over programs on the page below as an example). Its so close, yet... If I set the width of .sub-menu , it works and does not wrap, which is what i want. but then the dropdowns with 2 items only are 980 pixels wide!

I cant figure out where the width of the green box is comming from... please help if you can. I think it is a quick oversight somewhere?

development site:
http://nextstepintegral.kootenaywebhosting.com/

thanks!

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