Prefers dark mode in CSS

We can use prefers-color-scheme media query for dark/light mode styles.

body {
  font-family: 'Inter', sans-serif;
  margin: auto;
  max-width: 700px;
  padding: 1em;
  background: white;
  color: #222;
}
a,a:visited {
  color: blue;
}

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