Npm run watch

I have a question. When I start nom run watch I get no errors. But when I make a change I have to run rpm run dev again and I have to refresh my browser to activate the changes. There is also no message on the screen. In develop mode, chrome, I can not acces the style of tailwind.

in my webpack.mix.js

const mix = require('laravel-mix');

mix.js("resources/js/app.js", "public/js")
    .postCss("resources/css/app.css", "public/css", [
        require("tailwindcss"),
    ]);

and my tailwind.config.js

/** @type {import('tailwindcss').Config} */
module.exports = {
    content: [
        "./resources/**/*.blade.php",
        "./resources/**/*.js",
        "./resources/**/*.vue",
    ],
    darkMode: 'media', // or 'media' or 'class'
    theme: {
        extend: {},
    },
    plugins: [
        require('@tailwindcss/forms'),
        require('@tailwindcss/typography'),
        require('@tailwindcss/aspect-ratio'),
        require('@tailwindcss/line-clamp'),
    ],
}

I use PhpStorm.