#app{font-family:Arial,sans-serif;text-align:center;margin-top:50px}.countdown-container{max-width:500px;margin:0 auto;padding:20px;border:2px solid #4caf50;border-radius:8px;background-color:#f9f9f9}h1{color:#4caf50}input[type=date]{padding:5px;font-size:16px;margin:10px 0;border:1px solid #ccc;border-radius:4px}p{font-size:20px;color:#333}