OH2 using NGINX doesn't pass CSS and graphics to client

I run two RPi boxes (OH2 on Openhabian and nGinx on Raspbian). When I access my reverse proxy location, the html comes through but not the CSS and graphics.

The nginx error log show it looking in the ‘/’ location for graphics (i.e. file not found - /var/www/html/icon/switch). I suspect the same problem for finding the CSS.

Here is the site-enabled config:
server {
listen 443 ssl default_server;
listen [::]:443 ssl default_server;
ssl_certificate ssl/mysite.crt;
ssl_certificate_key ssl/mysite.key;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers HIGH:!aNULL:!MD5;
add_header Strict-Transport-Security “max-age=31536000; include Subdomains;”;


    location / {
            root /var/www/html;
    location /openhab/ {
            proxy_http_version 1.1;
            proxy_set_header Authorization "";
            proxy_set_header Host $proxy_host:$proxy_port;
            proxy_set_header X-real-IP $remote_addr;
            proxy_set_header X-forwarded-for $proxy_add_x_forwarded_for;
            proxy_set_header X-forwarded-proto $scheme;
            proxy_set_header X-Forwarded-Host;
            proxy_set_header Upgrade $http_upgrade;
            proxy_buffering off;

            proxy_cache_bypass $cookie_session;
            proxy_no_cache $cookie_session;



Do you find a solution ?