Introduction

Not much to add here as its the same as an older post: https://ip-life.net/how-to-auto-redirect-apache-default-webpage-to-a-specific-page/

Fix

The only difference required in CentOS is to actually make the index file in the /var/www/html/ location:

# touch /var/www/html/index.html

Then modify as per the old post to your requirements! Voila.