how do I change images (not background)

So recently I joined a message forum that doesn't have a dark mode. I've been successful in simply inspecting an element and changing the color, but now I'm having an issue with changing certain images. For example, when an image is read, unread, etc.

I though that:

background-image: url(blah blah blah);

would do the trick, but then it made it a background image, surprise. I also want to make sure that my replacement images properly match with if the section is read, unread, etc.
Sign In or Register to comment.