Make Sharing Icons Disappear to not overlap Footer

To save a lot of explaining on what i'm trying to do, check out this link and watch how their social icons fade out (or disappear) after it reaches the footer. On my site, even with the "vertical limits" set, the bar still overlaps content. i was wondering if it's a plugin issue or is that feature not available? Thanks.

Example site: https://www.americanexpress.com/us/small-business/openforum/articles/top-10-business-tips-from-this-weeks-open-forum-51/