The comments are in an iframe. So it has its own page, and wouldn’t let the background through anyway, seems like.

So… no, I don’t think so.

Okay I just made it so if you add background:transparent to the containerStyle option, then that propagates into the iframe and makes the background transparent. Let me know if that doesn’t work, or if you think it should work in a different way. I’ve tested only in Chrome linux:

https://perchance.org/comments-plugin-transparent-background-example#edit