How to customize Squid proxy error page

Customize squid error page.
Go to location
# cd /usr/share/squid/errors/en
# cp ERR_ACCESS_DENIED ERR_ACCESS_DENIED.org

Modify html file accordingly. 
#cat  ERR_ACCESS_DENIED

ERROR

The requested URL could not be retrieved

---

 

URL: %U

 

Access Denied.

 

This website is not belonging to company, if you need access of this website. Please email to IT Administrator.
Regards,
Shahzad(IT Administrator)