BBPress Avatar Issue

For some reason bbPress doesn’t seem to use the default “avatar” class that is generally used everywhere else in WordPress and it’s plugins. I think the class name is “bbp-author-avatar“. I am not sure how to add that to the existing styles for the avatar in the CSS file. I think it should be .avatar, .bbp-author-avatar {...} but this is where my knowledge ends.

Any help would be greatly appreciated.