Offline problem - responsive

[SandroSPBTC]

Sorry if my question in wrong place, please just let me know where I can place it.
I am trying to use iancoleman offline but the page (html file) that I open is not showing the same layout as online.
I have an old windows 7 notebook to work on it and I tried to use Internet Explorer, Chrome, Firefox as the web browser, I also use Ubuntu + firefox in a partition of this computer...same result.
Using on MacBook Air M1 everything is ok, on and offline.
Here it is the offline screen

thank you for any help

[evaporei]

You need to serve the folder with a tool like python -m http.server.

[iancoleman]

You should use bip39-standalone.html from the releases or load https://iancoleman.io/bip39/ and save that file.

Using index.html from the src directory is not recommended.

You can use python -m http.server and load http://localhost:8000 in your browser, but it's only recommended for development.

[denisdemaisbr]

you need extract to a folder
"tmp" indicate a using open zip