Hi, Ninja!
Sorry but I don't understand what you mean. Unfortunately, English is not my mother tongue. I will try to explain myself more clearly.
I added the code you gave me in the "edit custom css" panel but it didn't work.
The space between the menu and the module below it, whatever it is, always remains the same.
You can log in with the credentials I provided in the first post by verifying yourself. If the code only works with the demo then I understand that it is of no use to me because I need a slide module under the menu.
Where did I go wrong asking you for help? What did I have to check before writing?