Folks have been requesting dark mode. Not sure if I got the settings set up just right, but you should now be able to get dark mode going by hitting this switch under Interface in your user Preferences, saving the change, and then refreshing your browser.
Sub out “USERNAME” for your own in this link for a shortcut:
I believe the setting responds to your device’s dark mode setting, so you may need to change your device to dark mode in order for it to kick in. Ideally, we’d have a manual switch as well, but this is a start!