Making Answerly iFrame embed max width

I just wanted to know the iFrame embed code that you get for the Chatbot, can be a different size to the “Instant Embed” that normally appears on the corner of the screen.

So, if I have Div or Container, and I want the iFrame to be the maximum size, 100% width (or custom pixel size)n and or height of the container, then is that possible. I am not a coder but I tried to edit it using other iFrame codes without success.

See attached screenshot.
iFrame Screenshot

iFrame Settings Screenshot

If you know a way, then please let me know?

Thank you.