Make Top Menu Full Width

hi all

hoping that someone out there has a simple fix that they can assist me with - using the responsive out of the box theme: just want the menu bar "row" that is dark blue right now and is only as wide as the overall container - to be 100% wide but just the blue bar - the "electronics" menu item stays where it is - i just want that blue to extend to the left edge and the right edge like the very top header row with the currency and my account stuff.

Hope that makes sense