Feature Request - Add support for black or white backgrounds around the circle

[brkn]

Slack sucks with png images, it filled the transparent background with white.

[UmairJibran]

yep, that is a valid issue, slack added a white background to it, and it did not look good. I wonder if black would be any better.

What else can we do? Should we add black/white background ourselves, after a user toggles the transparent on/off?