body {
            margin: 0;
            font-family: Arial, sans-serif;
        }
        .popup-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.8);
            display: flex;
            justify-content: center;
            align-items: center;
            z-index: 9999;
            display: none;
            text-align: center;
            flex-direction: column;
        }
        .popup-content {
            margin-bottom: 20px;
            color: white;
            font-size: 1.5em;
        }
        .popup-image {
            width: 800px;
            height: 600px;
            border-radius: 10px;
            box-shadow: 0 0 15px rgba(0, 0, 0, 0.5);
        }
        .close-btn {
            position: absolute;
            top: 20px;
            right: 20px;
            width: 40px;
            height: 40px;
            background-color: #fff;
            border: none;
            border-radius: 50%;
            padding: 0;
            cursor: pointer;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.3);
            font-size: 1.2em;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        @media (max-width: 768px) {
            .popup-image {
                width: 90%;
                height: auto;
            }
            .close-btn {
                top: 10px;
                right: 10px;
                width: 30px;
                height: 30px;
                font-size: 1em;
            }
            .popup-content {
                font-size: 1.2em;
                margin-bottom: 10px;
            }
        }