Change the bottom border color of the last row in a table

Occasional Visitor

I have downloaded a Excel Quotation template from office and within this template there is a table. I want to change the color of the bottom border of the final row (now it is dark blue). I have tried to change this by altering the table style but the color does not change. The cells are marked as "Header row" and "Banded Rows". When I choose to create a new table style and then select "header row", choose Format and then change the color of the border nothing changes

How can I change the color of this bottom border?

Thanks in advance for the support!


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