None of the pages on your site appear to be scrollable on the desktop? It looks like you have an overflow:hidden attached to body, which will prevent anyone from being able to scroll down if their browser is not tall enough.
That doesn't sound right. What browser are you on? I've tested here on Chrome, Safari and Firefox (but not IE). I think it looks a bit wonky on iOS but I'm working on that.
EDIT: Found it. Thanks for the report - should be working better now.
