Adding a background fill color to the sheet tabs at the bottom of your workbook can help make them more visible. If you want to make other formatting changes to the text on a sheet tab, such as changing the font style, size, or font color, Excel doesn't support these changes.
To change the color of a sheet tab, right-click the tab, point to Tab Color, and pick a color that you want.
Tip
Click away from the formatted tab to see the new tab color.
To remove the color, right-click the tab, point to Tab Color, and pick No Color.