Now my tailwind working, but I still not understand that much

here's what I've done:

changed path in tsconfig.json from this:

"paths": {
      "@/*": ["./src/*"]
    }

to this:

"paths": {
      "@/*": ["./*"]
    }

that solved my problem all tailwind styled works perfectly fine.

In the end I still confused why I got issues. I follow every steps and the code exactly the same from NextJs Tutorial.