Hi,
Did you tried creating n access-list and and denying the specifies website ip from outside to internal /internal to outside request.
Following is an example:
access-list acl_out deny tcp 192.168.1.0 255.255.255.0 host 198.64.153.138 eq www
Description:
Acl-Out is access0-list name
192.168.1.0 is local subnet
198.64.153.138 is Public website Ip
www is http Port i.e. 80
To apply thsi access-list to interface we use:
access-group acl_out in interface outside
Thanks
Ck
Rate is it helped