Custom Theme PieChart Background Color not working

Hi all,

I'm trying to set the background of piecharts to a certain color for this theme, but my code is not working and I've tried many combinations.

Here is my visual styles section:

"visualStyles":{
"pieChart":{"*":{"background":[{"background":{"solid":{"color":"#404040"}}}]}},
"page":{"*":{"background":[{"color":{"solid":{"color":"#333132"}}}],
"outspace":[{"color":{"solid":{"color":"#333132"}}}]}},"*":{"*":{"outspacePane":[{"checkboxAndApplyColor":{"solid":{"color":"#FFD200"}}}]}}},
"textClasses":{"title":{"color":"#FFFFFF","fontSize":16},
"header":{"color":"#FFFFFF","fontFace":"'Segoe UI Bold', wf_segoe-ui_bold, helvetica, arial, sans-serif"}}}

The code runs but does not affect the pie chart background, please let me know what I'm doing wrong.

Thanks!