Using the browser view options, you can customize how your Excel work would look in a browser window. There are three ways in which you can display the contents of your Excel workbook over a ...

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.

The default active cell format in Microsoft Excel isn't all that easy to see, but you can use this easy-to-implement code solution to change that.