How to display a div ONLY in AMP and not on non-AMP pages?

Hello!

I saw this earlier thread about how to hide something in AMP with CSS, which was helpful for removing non-functioning content from our AMP pages: https://www.ads-software.com/support/topic/hide-in-amp/

However, I’d like to be able to display some alternate content ONLY to AMP visitors. How can I display a div ONLY in AMP and hide it on non-AMP pages?

Thanks for your help!