Need metamask integration with my website

I have made a python website (on anvil) that takes a users eth address, uses the opensea api to return token ids from a specific collection, and then counts those tokens as a number of votes in a poll.

The problem with this is that the user can input any eth address. Is there a way to remake the website so it calls the address from the MetaMask extension and could you do it?

Please let me know what you think.