This Tutorial shows you how to design your background.
At the beginning the background color is dark gray.
For Changing the background color left click on the colorpanel at Sky Color.
There are 2 options to add a new color:
1. Right click on an empty space on the gradient bar and click Add color
2. Drag the first color arrow down
Change the gradient by draging the color arrows up and down.
To remove colors right click on existing color arrows and choose Remove color.
The Ground Color can be generated by adding two colors.
By draging the lowest color you can define where your Ground Color starts.
Adding textures to the Sky box provides a more professional opportunity to define your background. To achive this result click on "Add Texture" above the Sky Color and Ground Color
You can choose between 2D and 3D background by checking is 2D.
If you use the sky box (3D background) you have to add six textures to create an entire surrounding sky box.