Hiding a div element in an iframe!

Hiding a div element in an iframe!

I'm opening several pages on my website in an iframe full-screen overlay. Those pages can also be accessed directly on my site.

These pages have a div that contains navigation. If a page is loaded in an iframe, I do not need the navigation so I'd like to hide he visibility of that div that has navigation.

So, pages appear as normal if accessed directly but if opened in an iframe their navigation is hidden.

Thanks in advance to all the geniuses here.