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;
}
img,
.astro-code,
.emoji,
iframe /* for recaptcha */ {
filter: invert(100%) !important;
}
}
Looks pretty good!