Newbie question about Export - solved, fault of my server (bad mimetypes)

I bought BSS today, and I’m trying to learn. I create new page (blank) and add login form, then export. In preview, there is all ok, but in exported data on my server, there something is not loading - backgroud image is in other directory (in export in assets/img/) and also login form is as without some css. In preview, there is livereload.js loaded.
I readed documentation about export, but nothing found. As this webserver is on our VPN I can use export to directory directly, not Publish (as it needs SFTP).
Could any help me?