Dark mode

Experiment

:root {
  --example-root-background-color: white;
  --example-root-color: black;

  background-color: var(--example-root-background-color);
  color: var(--example-root-color);
}

@media (prefers-color-scheme: dark) {
  :root {
    --example-root-background-color: black;
    --example-root-color: white;
  }
}