Reply To: site opens different in httpS

Answer from hosting:
“Hi Pavel,
the problem is that you have Mixed Content.
Some of your JavaScript files and Images are in http links, without the S, so while you browse in https the browser will refuse to load them because they are insecure!
You can check this if you open Developer Tools (F12) in the browser and click on the Console Tab”

your opinion? how to fix now?