body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #0f172a;
  color: #e2e8f0;
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

main {
  padding: 2rem;
  text-align: center;
}

h1 {
  font-size: 2rem;
  margin: 0.75rem 0 0;
}