I'm tring to crete an app using tailwindcss and next.js

I sterted creating the nextjs app, then I runned these commands:

npm install -D tailwindcss postcss autoprefixer

npx tailwindcss init -p

After that I updated the tailwind.config.js like:

module.exports = {
  content: [
    "./pages/**/*.{js,ts,jsx,tsx}",
    "./components/**/*.{js,ts,jsx,tsx}",
  ],
  theme: {
    extend: {},
  },
  plugins: [],
}

And, then I created and populated the ./syles/globals.css with:

@tailwind base;
@tailwind components;
@tailwind utilities;

all this step by step is on the website:https://tailwindcss.com/docs/guides/nextjs but still any attempt at customization doesn't work, is there any way to know if tailwind has been loaded? Was there something missing to be done?