You can change the default color of chart, graph, treemap, etc. in Word, Excel, and PowerPoint with the helpof these simple steps.

Microsoft Excel gives you a boatload of options for changing the format of color charts. You can change the layout of a chart, then customize that layout to the format you prefer.

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.