Sets the size value for each column

        Args:
            values (iterable of int or str): values are treated as percentage.

def set_column_sizes(self, values):
        """Sets the size value for each column

        Args:
            values (iterable of int or str): values are treated as percentage.
        """
        self.style['grid-template-columns'] = ' '.join(map(lambda value: (str(value) if str(value).endswith('%') else str(value) + '%') , values))