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How do I make a relative path in a custom CSS file to reference the file hosted in the course?

Question asked by Denis Marchi on Jun 27, 2019
Latest reply on Jun 28, 2019 by Joseph Hansen
I'm creating a theme for Canvas using a customized CSS file. My idea is to create a kind of layout/template that will use an image hosted inside the files folder of each course - I want to use a "background.png" file, and each course would have a different version of this file in its files folder.
How do I make a relative path/link so that it would automatically reference the file hosted in the course I put the link in?
For example, imagine a course of id 01, and another of id 02. Both would use a background image hosted in their own files folder. Then, in my CSS file I'd have something like this:
Background-image: url(/files/bg.png)
But those two courses would print different backgrounds, since I'd have two different file names "bg.png", each in their respective files folder. Could I create this kind of relative path/link here? If so, how?