Pie charts background color

If you want to change the pie charts background color please use this code inside the dedicated area for  Custom CSS Code under the Theme Options Panel:

.page-id-10 .pie-blank {
   border-color: rgba(255, 255, 255, 0) rgba(255, 255, 255, 0) #f7f7f7; 
}

You need to change the page-id from  10 to whatever is your page id (where you're using this shortcode).

The last color  (#f7f7f7) you can change it to whatever you need, while the rest remains the same.