body { margin: 0; font: 1.125rem/1.6 system-ui, sans-serif; color: #1f2328; background: #ffffff; }
main { max-width: 40rem; margin: 4rem auto; padding: 0 1rem; }
a { color: #0b57d0; }
@media (prefers-color-scheme: dark) {
  body { color: #e6edf3; background: #0d1117; }
  a { color: #79b8ff; }
}