As I'm sure you all know, Totoca12 and I have been working tirelessly on creating and improving new and exisitng tools in the game, as well as on forums. Our most recent development has been on forums with the new dark mode. If you haven't noticed already, we created a new dark theme for all users which can be applied at the bottom left at the footer of the page, or by clicking here. Along with the new theme, we've updated the Ghosting Moderator and Ghosting Legend banners to better match the style of the forums. We are open to ideas and we'd like to hear your thoughts!
If you mean the game itself, Free Rider Lite has a dark mode included, as well as various other colour scheme/palette options in the works. If you mean the actual website, you can turn on forced dark mode here: Force theme. It works exceptionally well, however, it may not work too well on other sites, and unfortunately as a developer, I cannot really use it since I need to see the real colours when writing my scripts. If you don't like that, then stay tuned as I have something in the works.
i do mean the website, and have also tried chrome flags for myself, but similarly to your problem it's a hassle to toggle it constantly i'll be waiting