One easy way to modify the appearance of a chart is to apply a new chart style.
Select the chart whose style you want to change.
On the Chart Tools–Design tab, select a new style in the Chart Styles group.
Excel applies the new chart style.
Note
Chart Styles The chart styles available for a chart are associated with that workbook’s theme and its colors. You can apply a new theme by clicking the Themes button on the Page Layout tab.
Tip
Preview Chart Styles Pause the mouse over each option in the Chart Styles group to preview its effect on your chart.