How to change color for the table borders in PowerPoint

Draw borders

To do that, select table or any (several) cells in the table and follow the next steps:

   1.   On the Table Design tab, in the Draw Borders group:

• Select the Border style:
  
• Select the Border weight:
  
• Select the Border color:
  

   2.   Do one of the following:

   2.1.   Draw the border where you want:

• After selecting border style or color, the Draw Table button is automatically checked,
• or if all that you want is selected already, just click the Draw Table button by yourself:

After any of these actions, your cursor will be changed to the pencil .

Now, draw the border where you need it. For example:

   2.2.   Choose the border style for the selected cells (or one cell or the table) - on the Table Design tab, in the Table Styles group, select the border:

Remove borders

• On the Table Design tab, in the Draw Borders group, click the Eraser button:
  

  Then remove borders you need.

• Select the cell or cells you want to remove the border from.

  Then on the Table Design tab, in the Table Styles group, on the Borders menu, click No Border:

  

See also this tip in French: Comment changer la couleur des bordures de la table dans PowerPoint.