The color to use in the area beneath your window's views.
- macOS 10.8+
Use this color to fill the backdrop underneath your app's main content.
When applied to an
NSBox object, this color supports Desktop Tinting in Dark Mode. With Desktop Tinting, the system modifies this color dynamically by incorporating some of the color from the underlying desktop image. The system does not apply this dynamic tinting effect to other types of views.