Changing custom font in every section

Hi everybody,
I already injected my custom font in CSS for h4-h2 and body, which worked fine.
Now I like to use that font for my portfolio grid titles and the the portfolio pagination too.

I tried this, and font-size has been changed, the font not. What did I miss here?

h3.portfolio-title {font-family: 'ALPINA REGULAR ITALIC';
    font-size: 20px !important;}

Thank you so much in advance!

Can you share link to portfolio page? We can check easier

Thank you for the response, the page is not online yet, how can I share it with you?

You can setup password & share url.

https://cobalt-duck-ndey.squarespace.com
pw: dKl28cvgTH90

Thank you!

Add this CSS

h3 {
    font-family: 'ALPINA REGULAR ITALIC' !important;
}
h2 {
    font-family: 'ALPINA REGULAR' !important;
}

Great that worked! But ist there any chance to edit the size of the portfolio grid titles and the portfolio pagination. The portfolio grid titles are h3 now, but changing the size there, doesn't do anything to the portfolio grid titles.