A MOUSE is considered a peripheral. A peripheral device connects to a computer system to add functionality.
Pick one of the cells you<span> want to format and then click the down arrow beside the </span>Borders<span> button in the Font </span>group<span> on the Home tab. A drop-down menu comes up with all the</span>border<span> options that </span>you can<span> apply to the </span>cell<span> selection</span>