Answers for "dark mode theme setup in css"

dark mode css

body {
  background-color: black;
  color: white;
}

@media screen and (prefers-color-scheme: light) {
  body {
    background-color: white;
    color: black;
  }
}

css dark mode

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