we required a custom home page for IWP so we created our own html page with css stylesheet which both worked when opened in isloation.
As soon as we moved the iwp_home.html and css stylesheet to the Web Publishing > IWP folder on our Windows FMAS 12 Server, all the CSS styling (and images) were lost. the html page opens but with no formatting. The css and images are kept in subfolders in Web Publishing > IWP.
Here is the html header we are using for iwp_home.html: