button {
            padding: 10px 20px;
            font-size: 16px;
            background: #4CAF50;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
        }
        
        button:hover {
            background: #45a049;
        }
        
        .popup {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            justify-content: center;
            align-items: center;
            z-index: 1000;
        }
        
        .popup-content {
            background: white;
            padding: 20px;
            border-radius: 8px;
            width: 300px;
            max-height: 80vh;
            overflow-y: auto;
            box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
        }
        
        .popup-content h2 {
            margin-top: 0;
            color: #333;
        }
        
        .language-list {
            list-style: none;
            padding: 0;
        }
        
        .language-list li {
            padding: 10px;
            border-bottom: 1px solid #eee;
            cursor: pointer;
        }
        
        .language-list li:hover {
            background: #f0f0f0;
        }
        
        .close-btn {
            float: right;
            font-size: 20px;
            cursor: pointer;
        }