Please read @PaulOB’s response in post #4 above.
This isn’t quite the code that I recommended in the previous thread (last item in this post)
CSS Styling vs Folder Path Query - #11 by ronpat
that created a one line high footer without margins. I’ll have to look further and see what your strategy might be. In the meanwhile, the inner <div> tag around the paragraph is not closed. If you are keeping the <div>, it needs to be closed.