Different background color in Emacs after 80 columns?

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.

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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.

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Source: https://habr.com/ru/post/983127/


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