New Sidebar-view backgroundcolor

Hi,

i try to create my own theme. But i did’t find the way how to change the background color of the sidebar for the new sidebar-view. The generic background will set with “primary-background-color:” but i will have to have that my side bar on the right side will have an other color as the generic background color. Any Idea?

The css variable ‘sidebar-background-color’ controls this.