Nginx maintenance page

Just some example code for an nginx maintenance page:

server {
  listen 80;
  listen 443 ssl;
  server_name www.example.com;
 
  ssl_certificate_key /etc/ssl/temp/wildcard.example.com.key;
  ssl_certificate /etc/ssl/temp/wildcard.example.com.fullchainchain.crt;
 
  location = /503.html {
      root /srv/http/maintenance/;
  }
  location = /logo.png {
      root /srv/http/maintenance/;
  }
   
  location / {
      if ($remote_addr != 1.2.3.4) {
        error_page 503 /503.html;
        return 503;
      }
  }
}