The icon is not visible, what could be the problem?

Question

css

To be honest, I don’t know what I messed up, but my icons disappeared. When you click on the places where they are supposed to be, everything works. I am tormented by vague doubts, maybe I'm somewhere with

Answer 1

To get started, open "Developer Tools" -> "Network" in your browser, do Ctrl+F5 (or whatever you have), and see what loads and what gives 404 Not Found.
Perhaps it will immediately become clear what is missing and why.