Set composition background color

The default background color for the Composition panel is black, but you can change the color at any time.

Choose Composition > Background Color, and then click the color swatch or use the eyedropper to pick a color.

Note: When you add one composition to another (nesting), the background color of the containing composition is preserved, and the background of the nested composition becomes transparent. To preserve the background color of the nested composition, create a solid-color layer to use as a background layer in the nested composition.