Theres a closed thread here…
https://meta.discourse.org/t/changing-or-removing-the-last-poster-avatar-highlight/27211
…which does not actually show how to get rid of the blue halo around the avatar. That is obviosuly useless now, as we have sanitized the avatar count to one. I hacked my using Chromes developer tools and got rid of it, but when trying to apply the same via Discourse Customization it does not work. Also the highlighted avatar is misaligned for some reason.
Any ideas how to eliminate the halo and fix alignment.