Changing drop down menu width

Hello,

I would like to change the width of the drop down list of my navigation menu, but can not seem to find how to do this? For example, the pages listed under “Build Log” have long, but relevant titles, so each item wraps to multiple lines. due to the number of pages this particular menu drop down becomes rather long.

Thanks!

-John

The page I need help with: [log in to see the link]