That pretty cool!

I made a dark theme for steemit over a year ago now, but it doesn't work anymore with all the design changes since..

I checked out that post! You were super new at that time. The post got you $0.49 ROTFL!!!!
Had you posted that today, it would be worth $500.00 with out a doubt! Funny when you are new to steemit, you are all inspired to make things and invest in the platform. After a while, you start making a little money and get complacent.
You might be the guy that has to bring this feature back. I am not trying to tell you what to do, but I personally think you should code this one up again and help the eyes of your fellow steemit friends. LOL