Setup Tailwind with Blazor in Visual Studio 2022

I've created a new Blazor WASM project. I removed bootstrap files(also from index.html) then I've setup Tailwind:

 npm init -y npm install -D tailwindcss npx tailwindcss init

added content: ["./**/*.{razor,html}"] in tailwind.config.js

created styles/app.css:

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

in package.json, added:

"scripts": {"css:build": "tailwindcss -i ./styles/app.css -o ./wwwroot/css/app.css",      ..      }

in BlazorApp3.csproj:

<Target Name="Tailwind" BeforeTargets="Build"><Exec Command="npm run css:build"/></Target>

the CSS file is created only when I start my project, after any modification app is reloaded but CSS is not rebuild