Tailwind help please

Now that my application is developed at 90% it is time to customize styling details. I have begun customizing my own Tailwind classes but NOTHING HAPPENS. Very probably I am doing something wrong.
I have followed the OD (Official Docs) here: https://filamentphp.com/docs/3.x/notifications/installation#installing-tailwind-css

For example, I have a resource table where I want to customize the row according to one $record->value, like this:

->recordClasses(fn (Model $record) => match ($record->facturado) {
    true => 'facturadoClass',
    default => null,
 })

And in my resources\css\app.css file I have put my new class:
@tailwind base;
@tailwind components;
@tailwind utilities;

.facturadoClass {
@apply bg-blue-500 text-white font-bold py-2 px-4 rounded;
}

And I run npm run build

What am I missing or doing wrong, please???
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