It is me again. Somewhere on the forum I have found a way to keep navigation always opened, exception is visiting website from mobile.
I have noticed when I customized navigation with this custom css I am not able to change font size in the navigation anymore. When I go to Appearance/Customize and navigation, I am trying to go with bigger font but it is staying the same. When I remove the custom css, now font is bigger. Somehow this custom css is overriding the default navigation menu control from usual Appearance/Customize option. Could I add something to this custom css to change font size?