I can't add new font

I chose the font I want (Raleway medium), I downloaded it, then I went to fontsquirrel and through the Font generator I downloaded the kit (which is a folder with all font formats (ttf, eot ect…) referred to, in my case, Raleway, and the stylesheet.css. I uploaded the files to example.com/wp-content/themes/hueman/fonts/raleway. (“raleway” is a sub-folder I created where I put the font formats and the stylesheet.css)

Then I went to the theme functions.php and I added this code:

add_action('wp_print_styles', 'add_custom_font');

function add_custom_font() {
    $url = 'https://www.simsworld.it/wp-content/themes/hueman/fonts/raleway/stylesheet.css';
    wp_register_style('ralewaymedium', $url);
    wp_enqueue_style('ralewaymedium');
}

Then I tried to use it by creating a new page and adding this:

<span style=”font-family: ralewaymedium”>Hello</span>

But it didn’t work, I also tried to add the font via @font-face but when I tried to type this:

p {
   font-family: ralewaymedium;
}

To the WYSIWYG default editor, it seemed wordpress saw that as a simple text and not as css code. (Obviously I used the text mode and not the visual mode)

Sorry for my bad english but I’m not english. Hope you will understand what I wrote. ^^’