single button navbar question

[Freewind]

Hello,
I have a question in regard to single-button-navbar usage, e.g. for smartphone variant. Normally, when using standard navbars, the button which is currently active shows a different color or whatever, which implements, this is the current and active page. When using single-button-navbar I can`t see such a behaviour, instead all popping-up buttons will show same style unless I hover one. I feel confused, when using a smartphone, activating the navbars but do not get any indication on the selection, that helps me to understand which the active site is.
Hope I explained properly.
Attached a picture which shows current status of such a single-button-navbar menu. You see, there is no indication, which page is currently the active one.


Ciao,
Freewind