Thank you for the quick responce (really impressive)... I did what you said but the content show up under the menu but not on the mobile black-background menu...
I tried to use the only-mobile module class suffix (in a Custom HTML module) but it still shows up when the screen is small under the menu (and not at the black-background mobile menu)
Also what about an update to the template will take place? this change is going to be deleted, right?