I would love a dark mode option for the appearance. I'm happy to build the feature and open a PR if the project is open to it. I'm thinking something like the new YouTube dark mode with light text on a dark background.
Go into settings and change the theme to Black...

That setting only changes the title bar for me.
I'm running version 1.3.4 and that setting only changes the title bar for me as well.
Oh yeah, forgot I had installed that. Install the cyborg theme plugin and then set the appearance setting to black to match.
That works, thanks!
Most helpful comment
http://plugins.octoprint.org/plugins/cyborgtheme/