Ah, it seems that the plugin's widget styles aren't applied at all, because the widget block in which the avatars reside has a non-standard css class name (
block-multiwidget_author_avatars instead of just
multiwidget_author_avatars). I think you have two options:
- find the place in your theme (or plugin?) where the css class names of widgets get renamed, and change it back to the defaults (i.e. no
block prepended to class names)
- copy all of the plugin's css rules (from [aa-plugin]/css/widget.css) to your theme and replace all instances of
Either way should work, but if you choose the later you will obviously have to maintain that bit of css (and any possible changes in the plugin) yourself...