Lol, no. I made a usercss for this (currently not released) but explicitly disabled it here. But that one uses a base style that switches via @prefers light/dark:

@media (prefers-color-scheme: dark) {
  :root {
    --text-color: #DBD9D9;
    --text-highlight: #232323;
    --bg-color: #1f1f1f;
    …
  }
}
@media (prefers-color-scheme: light) {
  :root {
    …
  }

Guess your site uses one of them too.