:root {
  color-scheme: light dark;
  background: #fff;
}

* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  background: #fff;
}

@media (prefers-color-scheme: dark) {
  :root,
  html,
  body {
    background: #000;
  }
}