Is there a chance to set a white 2px border left and right for the background-image? The image does not fill the screen and I have a backgroud-color behind, which is great. Even greater would be to give the image a white line left and right but as it is not separate div (?), I do not come to a solution on this without changing the image.
you can’t add a border to a background image, only its container which would be at the edge of the screen. You would need to add the border to the image as you suggested.