Css Full Width and Scroll Bar issue

My website

style css can be found here

I'm looking at my website on firefox, and I notice that the site is not stretching to the full width. You can tell by maximizing the page and then looking at the menu at the top right.

Also, there seems to be a horizontal scroll bar at all times which I don开发者_如何学JAVA't need unless the site is showing the full content area in the middle.

Any suggestions on how I can fix?

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To get rid of the horizontal scroll bar, try the following:

On DIV #master_wrapper remove:

float:left;
width:100%;

And add

overflow:hidden;
margin:0 auto;

On DIV #outer_wrapper remove:

float:left;
width:100%;

And add

overflow:hidden;

The site seems to go full width on Chrome ok.