CSS not found in assets

Hi, for some reason the css files cannot be reached when I create a css tag with <?= css('assets/css/style.css') ?>. I’m using MAMP to test the site, when I inspect the page and click on the link to the css file (<link href="http://localhost:8888/assets/css/site.css" rel="stylesheet">) the error page comes up. Of course the css file is located there. Does anybody know why this is happening?

Sorry, I forgot that it’s not the assets folder in the kirby folder, but that I have to create a separate one :dotted_line_face: