Embed website in my website using backend

I want to embed a website on my web gui (in python) for my personal application but the site doesnt allow iframe.

So i want to use my server as a middleman to download the pages and embed them.

But I need to download all the files, js, css, with the pages and load them like an iframe in the page.

So if I can make this work, what do i need to do on the client and server side?