size: 250 B

img {
  max-width: 100%;
  max-height: 100%;
}

@media (prefers-color-scheme: dark) {
  html {
    background-color: #222;
    color: #ddd;
    font-family: sans-serif;
  }

  a {
    color: cornflowerblue;
  }
  a:visited {
    color: violet;
  }
}