I'm trying to implement Responsive Nav from responsive-nav.com. For some reason I can't understand the toggle function is not working correctly.

I want the responsive-nav to collapse the nav to the "menu" toggle when the browser window is narrower than 37em. Currently at that 37em point the nav collapses but it is in the open state and causing the horizontal scroll bar to appear. You can see it here:

Any help in getting this to appear as the closed/collapsed "menu" toggle versus the open state will be much appreciated. Thanks in advance for any help!