Hi there,
it would require you to add a Wrap around the nav and the content to do that.
You would create 2 Hook Elements.
First hook
Content:
<div class="shadow-wrap grid-container">
<!-- open wrap -->
Note: the editor will add the closing </div>
– delete it.
Hook: before_header
Priority: 0
Second hook
Content:
<!-- close wrap --></div>
Hook: before_footer
Priority: 10
Default
Both hooks you will want to set the Display Rules to Entire Site.
Then you can target the shadow-wrap
class for your CSS