To no longer display black borders around selected table cells,
◦ on the Table tools Design tab, in the Borders Group, click the Borders button arrow and click No Border.
◦ from the Page Layout tab, open the Paragraph dialog box and clear the Cell Borders check box.
◦ select the table cells, right-click, and click Remove Borders.
◦ on the Layout tab, in the Table Group, click View Gridlines.