Remove Navigation Alignment Border

First I wanted to start off saying it's very disappointing to pay $49 for a theme that doesn't come with support. I also have to pay Catch Themes an expensive fee to ask them a support question?! Wow. I am trying to remove the faint borders around the navigation section of my website but none of the regular css border commands seem to work. The site is gasproshopfabrication.com and any suggestions is greatly appreciated! Thanks, Doug