How to add a simple dark mode

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I’ve used these few lines of CSS to apply dark mode to my website:

@media (prefers-color-scheme: dark) {
  body {
    filter: invert(100%);
    background-color: rgb(29, 32, 31) !important;
  iframe /* for recaptcha */ {
    filter: invert(100%) !important;

Looks pretty good!