Sets the gap value between columns

        Args:
            value (int or str): gap value (i.e. 10 or "10px")

def set_column_gap(self, value):
        """Sets the gap value between columns

        Args:
            value (int or str): gap value (i.e. 10 or "10px")
        """
        value = str(value) + 'px'
        value = value.replace('pxpx', 'px')
        self.style['grid-column-gap'] = value