1. Open Excel20 10 and select the cell or cell range to add border color.

2. In the menu bar at the top, find the Start Menu tab. On the Start tab, you will see an area called Fonts.

3. In the font area, find a button with an icon as a border. Click this button, and the drop-down menu of border setting will pop up after clicking the border button.

4. In the drop-down menu, you can choose different border styles and colors.