When SocialProfile (and thus its wAvatar class) is available, as is the case on Brickipedia, avatars overlap with blockquotes, as seen on this forum thread.
Giving the blockquote element a max-width of 85% on WikiForum pages (.mw-special-WikiForum) fixes the issue (see my Brickipedia refreshed.css for details), but it's totally possible that SocialProfile is not installed, which is what we'd need to take into account when implementing this fix.
This task has been assigned to the same task owner for more than two years. Resetting task assignee due to inactivity, to decrease task cookie-licking and to get a slightly more realistic overview of plans. Please feel free to assign this task to yourself again if you still realistically work or plan to work on this task - it would be welcome!
For tips how to manage individual work in Phabricator (noisy notifications, lists of task, etc.), see https://phabricator.wikimedia.org/T228575#6237124 for available options.
(For the records, two emails were sent to assignee addresses before resetting assignees. See T228575 for more info and for potential feedback. Thanks!)