Colors The colors used, can be overwritten in the Policy  diagramChartJSColors. The structure of the policy is very strict. The policy has to be formatted as a js array of strings that represent an rgb color. Thus: It has to start with  [  and and with  , ] . Each color has to be formatted as an rgb color and wrapped with  ' , and separated by  ,  eg  'rgb(255, 255, 255)', for a white color