This page is used to test the proper operation of the nginx HTTP server after it has been installed. If you can read this page, it means that the web server installed at this site is working properly.
This is the default index.html page that is distributed with nginx on Oracle Linux. It is located in /opt/rh/nginx16/root/usr/share/nginx/html.
You should now put your content in a location of your choice and edit the root configuration directive in the nginx configuration file /opt/rh/nginx16/root/etc/nginx/nginx.conf.