body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f5f5f5;
  color: #222;
}

.container {
  max-width: 720px;
  margin: 60px auto;
  padding: 24px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
}

button {
  padding: 10px 16px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
}

#message {
  margin-top: 16px;
  font-weight: bold;
}