Elements and hooks - container, php shortcode for gravity form on cpt single pos

Hi,

Looking to to something similar to this I believe:

https://generatepress.com/forums/topic/hook-and-php/

This is what I've tried:
(Please see screenshot) Note: Background of inner container is white.

https://www.dropbox.com/s/s9rbgvavo9bd2ie/generatepress__hook_p-h-p__shortcode.jpg?dl=0

Thoughts on the easiest, most efficient way to achieve this? Previously I was just hard coding it the the custom post type template file but then I'd have to create a div, css, media queries, etc.

Sincere thanks for your suggestions. Hope all is well.

Brad

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Shortcode code:

[gravityform id="1" title="false" description="false"]

<?php gravity_form(1, false, false, false, '', true, 12); ?>