Give members more class.
A Flarum extension. Adds class for logged in members. If someone is logged in, "logged-in" is added as a CSS class to the
body tag. This very simple extension will allow you to make endless CSS customizations just for members. (CSS knowledge required.)
composer require zerosonesfun/flarum-member
composer update zerosonesfun/flarum-member
(To remove simply run
composer remove zerosonesfun/flarum-member)