Rule to inject HTML/CSS with Cloudflare Teams / Gateway / Workers?

I’m looking to potentially onboarding a client with Cloudflare for Teams.

They have a unique situation and would like to basically put a giant red banner via HTML/CSS at the bottom of non-approved pages on a specific network. For example, say if they went to some random site like

Warning: You are browsing a non-approved website. Be careful about entering your information on this page.


Success: You are on an approved website. This website is safe to enter your information.

Aka, it would be kind of nice to have Cloudflare Worker code running in reverse of all web requests when connected and authenticated via Warp/Teams. Possible with Cloudflare?

Not an available feature at this time.


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