If you've been serious about what your Twitter profile looks like, we'll be disappointed. The social network deletes all background images and replaces them with a background in a neutral shade of light blue.
At settings Design of Twitter, you will see that the picture that you were using is still there and clicking Save Changes seems to revert.
However, when your profile was visited by someone else program browser that is not connected to your account, you will see that the image no longer exists.
No one knows why Twitter decided to remove it feature profile adjustment.
Perhaps because he wants to apply a uniform style, just like Facebook does, the background is the same for everyone.