body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #0f172a;
  color: #e2e8f0;
  min-height: 100vh;
  display: grid;
  place-items: center;
}

.card {
  background: #111827;
  padding: 32px 40px;
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(0,0,0,.35);
  text-align: center;
}

h1 {
  margin: 0 0 12px;
  font-size: 42px;
}

.small {
  opacity: .75;
  font-size: 14px;
}