sticky widget element

I was using the plugin Sticky Menu (or Anything!) on Scroll to stick a floating paypal donate button. While in Beaver builder, it crashed so that I lost the page was working on. I was able to recreate it, but I am worried about using it. My sandbox site where it is currently working is m.tinkeringgnome.com the live site (without the floating element) is at blackgirlinmaine.com

thanks for any help that you can offer.
dm