Just an FYI – when installing Cache Cleaner and other Regular Labs extensions using Admin Dark Mode, the confirmation text is not visible. The following text is from Cache Cleaner when I copied it to the clipboard, but not visibule to the eye as it has been reversed and is now on a white background (white text on white bg). This appears upon completion of the package install.
Adds option to purge Memcached cache
Adds option to purge Redis cache
Updates some deprecated code
This is more of a Joomla issue, as it doesn't have dark styling for the "bg-light" class.
I have changed it to a class that dark mode in Joomla does support. But that will only be used in future releases of the Regular Labs extensions.