Datatable styling priority

Is there any way to set the priority with which datatable styling is applied? For example I am trying to have black borders along the header and the first column and no borders elsewhere. I can achieve this by having in style_data_conditional:

        {
            'if': { 'column_id': col},
            'border': '0px solid white',
        }

for col being every column except the first, as well as:

            {
                'if': {'column_id': first_col},
                'border': '1px solid black',
            }

and in style_header:

{
        'border': '1px solid black',
    }

However the 0 weight borders in the body of the table are overwriting the black borders that overlap with the header. I was able to fix this problem happening with on the left overlap with the first column by reordering the style_data_conditional list, but Iā€™m not sure how to do the same for the header?