body{font-family:Arial,sans-serif;background-color:#f4f4f9;margin:0;padding:20px}.container{display:flex;justify-content:center;align-items:flex-start;min-height:80vh;padding-top:40px}.box{border:1px solid #ccc;background-color:#fff;box-shadow:0 4px 8px #0000001a;border-radius:10px;width:100%;max-width:360px;padding:20px;position:relative}.box-title{background-color:#007bff;color:#fff;padding:15px 20px;border-radius:10px 10px 0 0;text-align:center}.input-container{margin-top:20px;text-align:left}label{display:block;margin-bottom:5px;font-size:16px}input[type=text]{width:calc(100% - 22px);padding:10px;margin-bottom:10px;border:1px solid #ccc;border-radius:5px;box-sizing:border-box}button{width:100%;padding:10px;border:none;background-color:#007bff;color:#fff;border-radius:5px;cursor:pointer;margin-top:10px;font-size:20px;transition:all .2s ease-in-out}button:hover{background-color:#0056b3;transform:scale(1.1)}.result-container{margin-top:20px;background-color:#f8f9fa;padding:10px;border-radius:5px;text-align:center}.result{font-size:20px;color:#333}.promotion-container{margin-top:80px;text-align:center;font-size:18px;color:#333;font-weight:700}