def css_dependencies():
        """
        Returns list of CSS files that this XBlock depends on.

        The helper function that it uses to obtain the list of CSS files
        works in conjunction with the Django pipeline to ensure that in development mode
        the files are loaded individually, but in production just the single bundle is loaded.
        """
        if get_language_bidi():
            return get_css_dependencies('style-inline-discussion-rtl')
        else:
            return get_css_dependencies('style-inline-discussion')