.popup-overlay{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.6);z-index:9999}.popup-box{background:#fff;padding:20px;max-width:800px;margin:5% auto;border-radius:12px;text-align:center;animation:fadeIn .3s ease}@media (max-width:768px){.popup-overlay{overflow-y:scroll}}