This problem happens when I try to use a picture as the background.
This is difficult to explain in text.See the attachment.
The area surrounded by the red rectangle cannot be covered by the picture.
I tried to use a bigger picture but the situation is still like that.
Or it is only my own probelm?

This is difficult to explain in text.See the attachment.
The area surrounded by the red rectangle cannot be covered by the picture.
I tried to use a bigger picture but the situation is still like that.
Or it is only my own probelm?
