Just an FYI, Simon.
I use an iPhone 6 for mobile access, Safari, obviously.
It seems the padding or margin (left and right) for the navbar items is at 0px on the mobile view. The logo and "hamburger" icon for menu items is right smack up against the viewport.
If this is intentional, then nevermind. If this is not what was intended, I'll include a screenshot (if I can) to show the layout I'm talking about.