Responsive with Source Code.

Is there any CSS code I can inject using the Source Code version when embedding the code?  My analytics tracking doesn't work using the form in iframe. 

I would like to inform you that your form will also be responsive while using the source code. Although you can add the Mobile Responsive widget to your form if you want to make it more responsive. Here's a guide on How to Add a Widget to your Form? Then after adding the widget, you can simply get the full source code of the form and embed it to your page.

If you need further assistance, please let us know.
Regards.