Undefined namespace html (adding a css file to blade) laravel

I'm having trouble with importing a css style sheet located in public/css in a blade file located in resources/views/includes.

The code I used in the blade file is

which didn't work. I also tried

The error I get is Class 'HTML' not found

I followed the steps in this question, so

1. I added "laravelcollective/html": "5.4.16" in composer.json
2. run composer update

3. added in config/app.php

   'providers' => [
   Collective\Html\HtmlServiceProvider::class,
   ]
   
   

4. and

   'aliases' => [
   
           'Form' => Collective\Html\FormFacade::class,
           'HTML' => Collective\Html\HtmlFacade::class,
   ]
   
   

Now the error I get is

Class 'Collective\Html\HtmlServiceProvider' not found

And I don't understand why, as I added it to app.php. Indeed, when I go to app.php and the line where I added Collective.., the "Html" is colored in red and when I hover over it it says

Undefined namespace Html

What should I do about it? All this laravel thing is getting confusing to me.

Apart from the fact that I don't know what to do with,

i found nothing online regarding the arguments of "linkAction"

via Ileana Profeanu