Hi Cosmin,
thanks a lot for your reply, but I don’t want change the chart, I would change the background color of the section (widget) in wich are positioned the chart. I try to explain you: in the home page of your demo online of Flexform themes, under the slider there are 4 section (Incredibly Responsive – Swift Page Builder – Superior Typography – Stunning Sliders) and I would change the background color of this 4 section.
I would obtain something like this example in wich there are 3 section: red, green and blue.
