:root {
  color-scheme: light dark;
  font-family: Arial, Helvetica, sans-serif;
}

body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #0f172a;
  color: #f8fafc;
}

.card {
  max-width: 32rem;
  padding: 2rem;
  border-radius: 1rem;
  background: rgba(15, 23, 42, 0.92);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.25);
  text-align: center;
}

h1 {
  margin-top: 0;
}