When you select a single cell, the cell is highlighted with a colored border. When you select a range of cells, the range is highlighted with a colored border and all cells except the active cell are highlighted with a colored fill. System settings determine the highlight color, but if selected cells are not clearly visible, you can change to a color that provides more contrast.
Important
Changing the system settings will affect the appearance of all selections in all applications. For example, the new highlight color will indicate selected text in Microsoft Word or folders that are open in the Finder.
On the Apple menu, click System Preferences.
Click General.
In the Highlight color box, click the color that you want.
Note
You must close and then reopen Excel to see the new highlight color.