NGINX+wordpress: CSS being served but not applied

Cheers fellow stackers,

I kinda have to get wordpress running in a self hosted nginx environment.

More or less exactly using the suggested config from NGINX wordpress doc.

server {
    listen 443 ssl;
    server_name _;
    ssl_certificate /var/lib/nginx/PKI/www/server/cert.pem;
    ssl_certificate_key /var/lib/nginx/PKI/www/server/key.pem;
    root /var/lib/nginx/www/wordpress;
    index index.php;
    location / {
            try_files $uri uri/ /index.php?$args;

    }
    location ~ \.php$ {
        include /etc/nginx/fastcgi_params;
        fastcgi_intercept_errors on;
        fastcgi_pass php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    }

    location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
            expires max;
    }
}

Everything works mostly as expected, except for the styling. No styling seems to be applied on the site (also applies to the admin login/quickstart wizard).

Inside of the admin dashboard, everything looks fine.

CSS files are being served properly by NGINX.

My nginx config did not include the mime.types defaults.

That seems to be affecting the nginx "Content-Type" response header, leading to it being "text/plain" instead of "text/css" ...

... which is unfortunate because none of the wordpress templates specify the content type in the request, e.g:

<link rel='stylesheet' id='wp-block-library-css'  href='https://censored.net/wp-includes/css/dist/block-library/style.css?ver=5.8' media='all' />

Should probably look anything like this, but oh well

<link rel="styleseeht" type="text/css" ...>