When using a social login button, there is a completely unstyled page as an interstitial before login.

I copied the upstream allauth/templates/socialaccount/login.html and changed the first line from: {% extends "socialaccount/base_entrance.html" %} to {% extends "django_mailman3/profile/base.html" %}

This seems to work properly and look correct. Is there a reason not to PR this?

--Jered