Hi Roman, thank you for the hint, I did a mistake during copy/paste (maybe to late yesterday 🙁 ). In General, it works now.
Just one questions/ problem here and I would really appreciate, if you could solve it. It is just a “cosmetic” one:
While visit page or reload, the menu button looks fine, see: View before push
When you push the menu button, the lines insite this button moves out, see: View after push once
If you push again, the lines are still outsite, see: View after push again
I tried it without my css and inserted your code just in custom code in the theme, without success – still the same Problem.
This effect occurs just on the iPad, not with desktop browser or iPhones.
Many thanks for your help and great support in general!
Best regards, Frank