Migration test to github pages

I’m not sure what your actual question is. If you’re referring to the broken styles, that’s because several assets are throwing error 404: just check your browser’s console to see what’s missing.

I’m not familiar with the Simply Static plugin, and can’t say why it’s unable to generate static versions of those missing assets. Perhaps you shouldn’t be running any caching/optimization plugins at the time you generate the static version of the site? Dunno 😀

So I’ll kindly recommend that you post in the Simply Static plugin’s own support forum here, so the plugin’s developer and support community can help you out:

https://ww.wp.xz.cn/support/plugin/simply-static/

Good luck!