I use a stripe ad at the top of my site, and would like to delay the display of it until the visitor starts scrolling down the page, has scrolled Xpx, etc....is this possible?

An alternative I considered, was delaying the display of it by X seconds. I tried -moz-transition-delay: 10s;, but it did not work.

My stripe ad is all div's and css:

Code:
.stripe-ad { font-weight: bold; text-align: center;}
.stripe-ad a { text-decoration: underline;}
-Scott