Parameters
        ----------
        fill_dict : dict
            A dict with one or more of the following keys (or their synonyms),
                'fill_type' ('patternType', 'patterntype')
                'start_color' ('fgColor', 'fgcolor')
                'end_color' ('bgColor', 'bgcolor')
            or one or more of the following keys (or their synonyms).
                'type' ('fill_type')
                'degree'
                'left'
                'right'
                'top'
                'bottom'
                'stop'

        Returns
        -------
        fill : openpyxl.styles.Fill
        r