body{margin:0;padding:0;font-family:sans-serif;background:#f4f4f4;display:flex;justify-content:center;align-items:center;height:100vh}.countdown-container{background:#fff;padding:30px;border-radius:10px;text-align:center;box-shadow:0 4px 12px #0000001a}.countdown-display{margin:20px 0}.countdown-display input{padding:8px;width:160px;margin-bottom:10px}.countdown-display div{font-size:32px;margin-top:10px;font-weight:700}.countdown button{padding:10px 16px;margin:5px;border:none;border-radius:6px;cursor:pointer;font-weight:600;color:#fff}.countdown button:nth-child(1){background-color:#28a745}.countdown button:nth-child(2){background-color:#ffc107}.countdown button:nth-child(3){background-color:#dc3545}