iFrame bumps space in HTML box

I have one main HTML box to insert color boxes and sections on the page. It is one of the templates from the FW site. So, the lower right corner of this box is open for an iFrame. As soon as I put the iFrame in there (no matter how big OR small it is), I get an additional bump in the HTML box - I have tried everything to keep this a set space - the iFrame is set to scroll with 0 margins and 0 borders. So why would it continuously bump the main box down and mess up the spacing?

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