Style not applied

I’ve found the error, but I don’t know how to fix it.
The stylesheet URL included into iframe document is:

https://htmlintro.altervista.org/wpfacebook/wp-content/plugins/membri/htmlintro/wpfacebook/wp-content/themes/wpbook_theme/default/style.css

It should be the following:

https://htmlintro.ssl.altervista.org/wpfacebook/wp-content/themes/wpbook_theme/default/style.css

How do I change this?

Hi veleno sorry i didn’t see this earlier.

Is this still happening? On what page are you seeing the wrong css url?

Hello John. I fixed the issue. The problem was in the SSL certificate. With my certificate, the secure URL was not https://htmlintro.altervista.org/… , but something like https://htmlintro.ssl.altervista.org/… .
With such a URL, .css and .js files did not load in FB canvas page. I’ve changed host and SSL certificate, so the URL changed to https://example.com, and now everything works fine.
I’ve written an article where I speak about WPBook plugin. The article will be published on an italian computer magazine next month. Nice piece about WPBook ??
Thank you for your response.
Carlo