How do I change specific images?

So I go the hang of just inspecting an element and altering the color and whatnot, but the site I'm editing has images to designate if the forum has been read or not and those images clash pretty hard with the dark mode I'm trying to make.

It's your typical BBCode forum that I'm sure most of you are familiar with. I tried to attach a screenshot, but had issues so i hope what I am asking for is clear enough. I've only been successful in adding background images, but not properly replacing those that aren't in the background

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