Hamburger menu doesn't work on iOS #80
Description
I'm using minima for http://www.lunaryorn.com and just noticed that the hamburger menu doesn't work on iPhone/iOS: When I tap the icon the menu doesn't pop up. I went through a couple of phones on browerstack and could reproduce the problem with Safari on iPhones, whereas the menu works fine on Android devices with Google Chrome. Note the issues does also not appear in the "responsive" design modes of Safari and Chrome on desktop.
I'm not so familiar with CSS, and don't really understand how the menu's implemented in Minima, so I'm at a loss. I don't even know how to debug the issue given that it only occurs on the real phone.
Would really appreciate any help :)