body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  color: #222;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 2rem 3rem;
  text-align: center;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

h1 {
  margin: 0 0 0.75rem;
  font-size: 2.2rem;
}

p {
  margin: 0.5rem 0;
  color: #555;
}

button {
  margin-top: 1rem;
  padding: 0.7rem 1.2rem;
  border: 0;
  border-radius: 8px;
  background: #222;
  color: #fff;
  cursor: pointer;
}