How can I get rid of the container border around the menu bar?

I'd like to change the css so that there is no blue border showing on the sides of the orange menu bar; for example, if this was a Photoshop or Illustrator file, I would bring the orange navigation bar to the front on top of the page.

How can I go about changing this?

url: http://tinyurl.com/mcrqhua

Thanks,
Rebecca