Illustration show at the login page only

Question

I had custom the theme of ADFS, but I found the problem the illustration (the left big picture) only show at the login page (mean with the username/password login form). But other page like "Sign in to this site / Sign in to one of the following sites" at idpinitiatedsignon.aspx and the page after successful login, cannot show the illustration, only show blue area. And I found that the browser cannot not show the illustration for those page at .illustrationClass for those page. The screenshot that I attach is the page that can show the illustration, other page do not have this box.

Answer 1

Are there any custom themes involved here?

ADFS on Windows Server 2016 can have different themes per Relying Party Trust. And the IDP initiated sign-in page will not have any of these.

Also, there is JavaScript in the default page to show the illustration only if the size of the window allows it. To avoid downloading the illustration picture on small screen (mobile and pop-ups), the class gets updated with an URL only when the size of the current window will have enough room for it.