#custom-popup{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);background:#fff;border:2px solid #ccc;padding:20px;z-index:1000;box-shadow:0 0 15px rgba(0,0,0,.3);width:300px}#custom-popup-content h2{margin-top:0}#close-popup{background-color:red;color:#fff;padding:5px 10px;border:none;cursor:pointer;float:right}#custom-popup-content{position:relative}