Error page template

<VirtualHost *:80>
		
		ErrorDocument 404 /custom_404.html
		ErrorDocument 403 /custom_403.html
		ErrorDocument 500 /custom_50x.html
		ErrorDocument 502 /custom_50x.html
		ErrorDocument 503 /custom_50x.html
		ErrorDocument 504 /custom_50x.html

</VirtualHost>

https://www.digitalocean.com/community/tutorials/how-to-configure-apache-to-use-custom-error-pages-on-ubuntu-14-04