Is possible to open "offline" the web-file saved on computer?

When I open (with browser) a saved htm-file аs a rule this file takes css-files and pictures from third party sites in the internet.
How to block this connections ? (now I have to switch off the internet wire from my computer)

I would seek the solution in how you save the website from a browser rather than let the firewall do the work. CIS is not a very suitable tool to block ip addresses or hostnames.

MyUser;

As Eric as Suggested; You may want to search out a different way of downloading webpages for offline viewing;
I would recommend HTTrack

Thanks…Jake