Niginx server

Install nginx, start and enable nginx successfully but when point to server http://server_domain_name_or_IP/ but not able to see default CentOS 7 Nginx web page.
I am following this guide https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-centos-7.
when i point ip address in the browser web page is shown in the below image