As someone who uses their computer often in a dark environment would be nice to my eyes if you could add a dulled, dark or night theme to the forum.
I agree with Gamepaw. I use my computer always in dark room (Even during the day it's almost complete dark) and current theme cause my eyes hurt after a while. It would be nice to have some darker theme :)
One of the first things I did after signing up was look through the various menus and options for a darker theme, to no avail.
Considering I nearly decided against posting on the forums at all because of theme, I have to support this suggestion.
Get a dark mode extension for your browser, for instance, for Firefox: https://addons.mozilla.org/en-US/firefox/addon/dark-mode-webextension/ That will allow you to rest your eyes while retaining readability for those not keen on dark mode screens. ^_^