Nav bar not scrollable, issue still open Bootstrap

Hello ,
I have added the id as suggested but still the navigation bar is not scrollable, so there is a basic error but I’m not able to find it. My final goal is to have a simple page and I would like to use the cards because I find them nice. I have to link the nav bar items to the title text on cards. If I cllick Portfolio nothing happens, it should instead take me on the portfolio card.
Could you give me a tip to fix the issue? Thanks again for your help.
Link on my simple page under construction:

set position: fixed ?