How to allow only 2 sites in Web-proxy & block others?

How to allow only 2 sites in Web-proxy & block others?

That allow only one site:
/ip proxy
add action=deny dst-host=!*gmail.com src-address=192.168.0.0/24

no, simpler. just add all good sites, and then add one empty rule with action deny at the end

Thanks :slight_smile: