Showing a different background colour in Vim past 80 characters

Question

I have seen Vim 80 column layout concerns, but the answer there highlights only actual content that goes over the 80 character mark. I want to have a 100+ column Vim window

Answer 1

I don't think that it's possible to have what you want, but I following this question since I am interested in such a thing myself.

Maybe, I am stating the obvious, but you could setup the highligth in the 70th+ columns to get an indication of how close you get to the 80th column.