Loss of css code when switching to https, how to fix?

Question

css

When switching from http to https, many pages began to look incorrect. With http encryption, everything worked great.
How to fix it?
The console outputs the following:

Mixed Content: The page at '<URL>' was loaded over HTTPS, but requested an insecure stylesheet '<URL>'. This request has been blocked; the content must be served over HTTPS.

Answer 1

browser blocks http resources on page with https
fix - make your files available via https

Answer 2

When connecting scripts and styles externally, we remove the protocol
like this

<link rel="stylesheet" href="//assets.example.com/style.css"/>