body{margin:0;padding:0;font-family:Arial,sans-serif;background-color:#f2f2f2;display:flex;justify-content:center;align-items:center;height:100vh}.box{background-color:#fff;padding:30px;border-radius:10px;text-align:center;box-shadow:0 4px 10px #0000001a}.counter{font-size:24px;font-weight:700;margin-bottom:20px}.btn button{padding:10px 20px;font-size:20px;margin:0 10px;background-color:#3498db;color:#fff;border:none;border-radius:6px;cursor:pointer;transition:background .2s}.btn button:hover{background-color:#2980b9}