body {
  margin: 0;
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  color: #1d1d1f;
  background: #fafafa;
}
main {
  max-width: 40rem;
  margin: 4rem auto;
  padding: 0 1rem;
}
@media (prefers-color-scheme: dark) {
  body { color: #eee; background: #161618; }
  a { color: #8ab4f8; }
}