Launch Microsoft Excel. Click the Developer tab, then click the Visual Basic button. Once the VBA Editor is open, type the code to change the color of the cell.

To change Gridline color in Excel, use Excel Options, apply a custom-colored border to the cells, or apply a custom line color. Full details here.

You can change the color of the default gridlines in Excel from the File tab, by selecting Options, Advanced. In the Display options for this worksheet section, click the Gridline color drop-down box ...