body { font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto; padding: 20px; text-align: center; } .container { background-color: #f4f4f4; border-radius: 10px; padding: 20px; box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1); } button { background-color: #007bff; color: white; border: none; padding: 10px 20px; margin: 10px; border-radius: 5px; cursor: pointer; transition: background-color 0.3s ease; } button:hover { background-color: #0056b3; } #output { margin-top: 20px; font-weight: bold; min-height: 50px; background-color: #e9ecef; padding: 10px; border-radius: 5px; }