We have added three styles of a block page for you to choose from.
Alerting red with a distinctive warning that content is forbidden to access. Its great to make sure that viewer will see that page had adult content or was blocked by you.
Soft gray page for less aggressive everyday usage with just skipping the sensitive content.
And a google 404 error page, so blocking would be hidden and it would seem that this site or page is just unavailable or closed.