How to Add Cell Borders and Background Colors in Excel
Adding cell borders and filling cells with colors and patterns is an easy way to make your data stand out, appear more organized, and make the spreadsheet easier to read.
Select the cell(s) where you want to add the border.
Click the Border list arrow from the Home tab.
A list of borders you can add to the selected cell(s) appears. Use the examples shown next to each border option to decide which border type will work best for you.
Select a border type.
To remove a border, click the Border list arrow in the Font group and select No Border.