How to show element in selective pages <e.g., .elgg-page-header> >

I want to have .elgg-page-header visible on the home page only, however, as the users logs in, I want to hide/remove this header. How can I do that?

I can do the hiding part for all cases, that hides it from the home-page (before log in), and anywhere else. Please put some lights on this? Thank you. Bests.