How to add a separating line between the top area and the plot background in Excel As is, the color of the top area is so light that it fades into the plot area, which is white.

To change the background of your graph, click in the space between the plot area and the edge of your graph. Then, click the Drawing toolbar’s Fill Color tool and select a color from the palette.

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