Board Thread:Support Requests - Getting Technical/@comment-5030775-20190314212338

I would like to create a series of mw-collapsibles (if you don't know what I mean, there's one on this page) with an image replacing the "Expand" and "Collapse" text. I believe I found a solution in this thread, however, I don't want to alter the overall every collapsible on the wiki and I need to create a lot of collapsibles with different images. Is there a way to alter collapsibles in the  ? Otherwise, how can I edit the CSS to have different collapsibles? 