If you like a PivotChart style but not the colors that come with it, you can choose a different color scheme.
Click the Change Colors button on the Design tab.
A menu of color schemes displays. The color options are broken into two categories: Colorful and Monochromatic. You can hover over an option in the menu to see what it will look like before selecting it.
The color schemes in the list coordinate with the theme that’s applied to the workbook.