Nginx location not working when changing php page

I don't understand why the below Nginx config allows me to get to my index.php ok:

http://localhost:8080/nesting/index.php

but all dependencies of that page, like css, img keep pointing at http://localhost:8080/... So everything looks broken. Likewise when moving on to another page it keeps pointing at the root url.

How to make the subdirectory persistent?

server {
listen 8080;

server_name localhost;
root /var/www/html;
index index.php index.html index.htm;

# compression setting
gzip_vary on;
gzip_proxied any;
gzip_comp_level 5;
gzip_min_length 100;
gzip_http_version 1.1;
gzip_types text/plain text/css application/json application/javascript text/xml 
application/xml application/xml+rss text/javascript text/json;

 location ~ [^/]\.php(/|$) {
   fastcgi_split_path_info ^(.+\.php)(/.*)$;
   set $path_info $fastcgi_path_info; # because of bug http://trac.nginx.org/nginx/ticket/321
   try_files $fastcgi_script_name =404;
   include fastcgi_params;

   fastcgi_index index.php;
   fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
   fastcgi_param PATH_INFO $path_info;
   fastcgi_param PATH_TRANSLATED $document_root$path_info;
   fastcgi_pass unix:/var/run/php/php8.2-fpm.sock;
   fastcgi_param SERVER_NAME $http_host;
}

location /nesting/ {
   alias /var/www/html/nesting/;
   index admin.php index.php;
}