This article provides step-by-step instructions for color customizing your drop-down list in Microsoft Excel.

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 ...

Learn how to create a drop-down list in Excel without or with color using conditional formatting and data validation rules.

Moreover, if you choose to take advantage of Excel's table-formatting tool, or manually apply colors to separate rows and columns, removing the gridlines helps with aesthetic presentation.