Reaction background is not consistent with the page

[LecrisUT]

Disclaimer: I am opening this issue on behalf of Caddy for this issue. Hopefully one of the admins there will come to this thread shortly with more details on the implementation if necessary.

Using the most recent version v1.2.3, the background of the reactions does not match the page, although according to #35 this issue should have been fixed. Here's a screenshot for reference:

I'm not personally familiar with this plugin and whether this is just a misconfiguration somewhere. In the most recent version, do the emoji set have a coloured background or is it transparent?