Roost WordPress plugin creating space at the bottom of each page

Hello,
I have a problem on my WordPress sites which are using the Roost plugin. At the bottom of the page, I see a narrow space with the background of the page. I want to remove it. I believe it’s created by the Roost iframe code, you should hide it in some way so it’s not causing this issues.

<iframe style=”width: 0px; height: 0px;” src=”https://get.roost.me/roostbutton/Track?rand=0.63605369720608″></iframe&gt;

https://www.ads-software.com/plugins/roost-for-bloggers/