/* Style for the overlay (background of the popup) */
        .overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.5);
            display: none;
            justify-content: center;
            align-items: center;
            z-index: 100000000000000;
        }

        /* Style for the loader in the popup */
        .popup-loader {
            border: 4px solid #f3f3f3; /* Light gray */
            border-top: 4px solid #009900; /* Blue */
            border-radius: 50%;
            width: 50px;
            height: 50px;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Disable button style */
        .disabled {
            background-color: #cccccc;
            cursor: not-allowed;
        }