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 ...

How to hide Gridlines in Excel If you do not like the default color, you can change it to a color of your choice or even remove them. What are the benefits that Gridlines offer in a worksheet?

Avoid frustration and unintended formatting by learning how Excel applies conditional formatting rules.

You can also hide the gridlines in a certain section of your spreadsheet by color-filling the relevant cells in white (or another color of your choice).

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

Want to to alternate row colors in Excel? You can apply color in alternate row & column in Excel spreadsheet using Conditional Formatting.