On mobile, iPhone 5 in my case. The dropdown menu does not retract after an onclick event. One needs to hit the “menu” again to dismiss the menu so that it does not overlap the content.
menu-toggle is used for the h1 tag in header.php but I don’t believe the menu-toggle is being applied to the list items.
Anyway, I’ll work on a fix also and see if I can figure it out. I’ll post back here if I do.