Scrollbar on iframe

I’ve just added Stratus to https://2013.koortwah.com/ and can’t figure out how to get the scrollbar to disappear in Chrome and Safari, despite putting “overflow-y:hidden” on all the relevant elements. Is there a way “scrolling:’no'” could be added to the settings so that the iframe loads without it?

Thanks!

https://www.ads-software.com/plugins/stratus/