What I would do is added “fake menu” div in between nav and next section. Then I would give menu some height and create interaction for menu-button with click trigger:
1st click - “fake menu” height become equal real menu height,
@sabanna - hey long time! It’s nice to hear from you. I apologize for not making myself clear, but if you scroll near the bottom you will see I have a menu button for a good menu, not the pages navigation.