Remove partial border from embedded iframe code. 

I have questionnaires imbedded by our CRM. I can't figure out how to get rid of this border. it shows up as a partial border on mobile. 

I do have border:0 in my codeblock and afaik that is supposed to take care of it. 

I've searched for "border" in our custom CSS but see nothing there so I don't think its coming from there? Newbie with Squarespace and not super well versed with code. 

The page in the example isn't published yet, but there's another example of an embedded form here. 

Thanks in advance.

Add this code to bottom of CSS box

#TaveContactForm {
    border: none !important;
}

Thank you, that worked. Cheers