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.
But it was just chalk?
That’s plain spite.