In Emacs, how to set a different background color after 80 columns?
So, if the window is wider than 80 columns, all columns after 80 will have a different background color.
I think you can do this using whitespace-mode and then a suitable whitespace-style setting to just select 80 columns and then adjust the face that is used to set the background color.
whitespace-mode
whitespace-style
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