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

.container {
  max-width: 720px;
  margin: 80px auto;
  padding: 32px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0,0,0,0.08);
  text-align: center;
}

button {
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 16px;
}

pre {
  margin-top: 20px;
  padding: 16px;
  background: #f0f0f0;
  text-align: left;
  overflow-x: auto;
  border-radius: 8px;
}