How to Keep Chart Background Color in to two Types

Hi Expert's,

I Am Working on Design studio Project Here I got One requirement on Chart Back ground Color i.e The Chart Showing Historical And Forecast Data the client Requirement is for historical data they needone chart background  Colour and for Forecast data they need Another chart Backgroud Colour.

Here Jan,Feb indicate Historical Data Mar Indicates  Forecast Data ,Is it Possible to keep two different Chart Colours if  possible kindly Help on this.

I have Checked following Links.

List of CSS for SAP Design studio

Design Studio - how to set up chart labels at c... | SCN

Styling a chart in Design Studio