I am using variant 6 but it does not seem to be responsive. When I re-size the browser window I see a scroll bar at the bottom.
The problem was the navigation id in the layout fixed.css I remove the margin-right: -100%
float: left; /* LTR */
margin-left: 0; /* LTR */
padding: 0; /* DO NOT CHANGE. Add padding or margin to #navigation .section. */
height: 3em; /* The navigation can have any arbritrary height. We picked one
that is the line-height plus 1em: 1.3 + 1 = 2.3
Set this to the same value as the margin-top below. */