:root { color-scheme: light dark; }
body {
  margin: 0;
  font-family: system-ui, sans-serif;
  line-height: 1.5;
  display: grid;
  place-items: center;
  min-height: 100vh;
}
main { max-width: 40rem; padding: 2rem; text-align: center; }
h1 { font-weight: 600; margin-bottom: 0.5rem; }
.note { opacity: 0.7; font-size: 0.9rem; }