html, body { margin: 0; height: 100%; }
body {
  display: grid;
  place-items: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  color: #111;
  background: #fff;
}
main { text-align: center; }
h1 { font-size: 2rem; margin: 0 0 0.5rem; }
p { margin: 0; color: #666; }