Get background image fixed when published?

I have built a website and it has looked good in preview mode. But now when I try to publish it to the Webflow domain, it does not look the same as in the preview.
It is the background image with the northern lights that does not look the same in preview mode as live.
How do I solve it?

Here is my site Read-Only:

Here is the live domain:

I think I´ve fixed it. I couldn´t have the image in the body. I had to do a div to put every section that would had de same background-image inside that div.