/* Modal */
        .modal {
            display: none; 
            position: fixed; 
            z-index: 1000; 
            left: 0; top: 0; width: 100%; height: 100%;
            overflow: auto; background-color: rgba(0,0,0,0.5);
        }
        .modal-content {
            background-color: #fff; margin: 15% auto; padding: 20px;
            border-radius: 5px; width: 300px; text-align:center;
        }
        .close { float:right; cursor:pointer; font-size:20px; }
        input { margin:5px 0; width:90%; padding:5px; }
        .error { color:red; }