Cell borders and fill colors are useful for creating clear boundaries in your worksheet. They help to separate different sections and make your data easier to read. Here’s how to add them:

To add a fill color:

1. Select the cell(s) you want to change.
   
   
   
2. On the Home tab, click the drop-down arrow next to the Fill Color button.
   
   
   
3. Choose the color you want to use. In this case, we’ll select dark gray.
   
   
   
4. The fill color will appear in the selected cells. For better visibility, you can also change the font color to white.

To add a border:

1. Select the cell(s) you want to modify.
   
   
   
2. On the Home tab, click the drop-down arrow next to the Borders button.
   
   
   
3. Pick the border style you want. In this example, we choose "All Borders."
   
   
   
4. The border style will appear around the selected cells.

You can also use the Draw Borders option at the bottom of the Borders menu. This tool lets you draw your own borders and adjust their style and color.