It isn’t really clear what you’re asking for help with. Can you be more specific? It would help if your CodePen only showed the one problem too. A whole page/codebase-in-progress will likely put folks off. Try to keep it small and very specific so that it doesn’t come across like a “rewrite my whole layout for me” request.
I am sorry, I edited it now. The problem is that the page doesnt become responsive. I added the code for all devices, and container max-width for the grid. Do I have to add max width in % maybe? or put all the columns of the grid in the code with it?