[GMAIL] Send and Wait for Response - Custom CSS does not work as intended. Any way to fix?

Describe the problem/error/question

Trying to use the GMAIL Send and Wait for a Response and making a custom form.

N8N offer a custom CSS to edit:

My problem is that the –container-width:448px, even if edited, changes absolutely nothing.
I tried setting 20px, 100%, 900px, literally anything, but the actual container remain 448px.

Not only this break Responsiveness for smartphones, but this does not really allow customization.

Any way to make it work better?

I think custom css (with some limitations to certain elements) are available only for Form nodes).