I tried changing the forum's theme to dark mode, it was showing disabled 45. In fact, there was no available theme, only the forum's default theme. I literally set the theme of my phone and pc to dark mode, it helps my eyes from being affected by the ray of light. Is there a way the themes can be fixed @PowerGlove 
I think your browsers should be responsible for that! I use opera mini before hand and it has an option of dark mode/night mode.
I also don't think that's a bug but it's just your interest and wants to see that integrated into Bitcointalk which is not a bad idea the only thing there is that what you desire someone else out there may not desire that or want it, it's simple.
Maybe you should consider using the browser feature instead of waiting on it on the forum itself.