Strange CSS class used in email signature template

I am debugging email signature issues in Outlook for Mac (v16.34) and I have come across css classes that are used that I've never seen before and don't seem to reference anything directly:

class="sc-jDwBTQ dWtMUn"

I pulled a signature template off github: https://github.com/shiweifong/lethoe/blob/master/signature-june.html

If anyone has any insight into what this class is I'd really appreciate it. I can't find anything concrete online.

Thanks!