My form isn't transparent on Google Sites

I've created a basic Contact from using JotForm, but I'm unable to make it transparent on my website.  I changed the background color to 'transparent' in Preferences, and I changed the background opacity to 0% within the Designer.  When I preview it, it shows up transparent.  Is this a limitation with Google sites or is there a setting that I'm missing?  I appreciate your help with this!

It looks like your page is not accessible for us to check it out:

I have tested it with a transparent form embedded on my own Google Site, and I can replicate the issue. Even though the form itself is transparent, the form's iFrame is placed inside yet another iFrame on the Google Site, and this second iFrame has a white background set to it.

Unfortunately, I can't find any way to edit this part, and it is outside the form itself so we can't influence it with changes to the form.

I am sorry that this post didn't resolve your issue, but I'm unable to find a way to force that outside element on Google Sites to be transparent. I hope this helps.