The 40px spacing applies to the iframe for the entire HTML question. Whilst your trick worked for me, I'd suggest moving all of your Question Text to inside the Question HTML: part of the response area:

Thank you, I just sent you the texts.

Updated basic template for linked answer boxes:  LinkedAnswerBoxes.zip

@jmtrik If .js files are not allowed, you can get around this by uploading them as .txt and linking to those.