number_italic`
        Whether line numbers will be italicized: True/False

        Default: False

    `line_number_separator`
        Whether a line will be drawn between the line number area and the
        source code area: True/False

        Default: True

    `line_number_pad`
        The horizontal padding (in pixels) between the line number margin, and
        the source code area.

        Default: 6

    `hl_lines`
        Specify a list of lines to be highlighted.

        .. versionadded:: 1.2

        Default: empty list

    `hl_color`
        Specify the color for highlighting lines.

        .. versionadded:: 1.2

        Default: highlight color of the selected style
    