Having dark themes on web pages is the new rage and I do think it's ergonomically easier on the eyes. So I spend a little time over the last few days creating a new "skin" as its called making a "Moonlight" version for 4um. You can choose in in the setup. It's based on the "Simple" skin, modified for a dark theme. Of course it's the first new luxury enhancement added to the site in about 20 years. Maybe some will prefer it. Probably needs some tweaking here and there.
I could make a version for smart phones as well. I notice the nav links are infinitesimal when showing the normal page on a smart phone.
Enjoy.