:root {
  --background: #fff;
  --color: #000;
}

html {
  background: var(--background);
  color: var(--color);
  height: 100%;
  overflow: hidden;
}
body {
  height: 100%;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
}

@media (prefers-color-scheme: dark) {
  :root {
    --background: #000;
    --color: #8d8d8d;
  }
}