<no theme, only text

Where does your css link to? Is it also “localhost” or https://www.somewesbite.com ?
Try searching to bladiebla.css in your page source!

I did not have https://www.something.com when I installed WP, only dynamic ip number. Now I have service from DynDNS.org, but I dont know where to put this address.

If I look the source code, it’s https://localhost/

I understand this problem, but why I can see selected theme on sever-pc but not via internet.

admin Options > General
change the two URIs from localhost to whatever your address is.
When accessing something with “localhost” in address… every machine thinks of localhost as themselves ??