The design fell off when changing the CMS. What's the problem?

Question

WordPress

There was a self-written site, we decided to remake it on WP. The domain has remained the same.
worked on the design a bit, changed the ns domain, a day passed - in the end, this is what prntscr.com/9yspo0
What is the reason?

Answer 1

The style file is:

perfekt-travel.ru/css/liMarquee.css

. It does not exist on the server (gives 404 code), most likely the path should be

perfekt-travel.ru/wp-content <template name>/css/liMarquee.css

Also listed as a domain

cf70120.tmweb.ru

, but should be

perfekt-travel.ru

https://yadi.sk/i/5WT6y4-ioJAXh Most likely you need to fix the value in the database (look at the articles "transferring WordPress to a new domain" in search engines).
After following the recommendations, you can look further.

Answer 2

Your styles have gone wrong...
1. the theme of the WP must have a style.css file, even if there are only comments
2. an external style file may have been connected
3. the site may have been connected to the CDN on the hosting, with the change of ns- ov the subdomain for the CDN has gone or where it was connected to..