How to adjust background color with Cinemachine virtual camera?

I suppose, Cinemachine hasn't got same features with camera.
How can I adjust background color?

 

As far as I can tell, Cinemachine 'cameras' are just proxy's for the main camera in the scene, so any changes applied to the camera work for the Virtual Cameras.

 

I understood.
How can I apply this changes?

 

Code (CSharp):

1. Camera mainCamera;
2.  
3. void Start()
4. {
5.      mainCamera = Camera.main;
6. }
7.  
8. // ...
9. void ChangeBGColor(Color color)
10. {
11.      mainCamera.backgroundColor = color;  // <---
12. }
13.  

 

You also need to have your camera setup to use the background color instead of the skybox.

 

Thanks sir.