ackground: #ffffff;
        }

        .chat-header {
            background: #4caf50;
            color: white;
            padding: 15px;
            font-size: 14px;
            font-weight: bold;
            text-align: center;
            cursor: pointer;
        }

        /* Sample questions dropdown */
        .sample-questions {
            padding: 10px;
            background: #f9f9f9;
            border-bottom: 1px solid #ddd;
        }
        .sample-questions select {
            width: 100%;