How to cover whole page with a popup in Dawn theme version 11.0.0?

Mohit_garg
Shopify Partner
15 0 1

Hi,
I was trying to make the shopify theme extension app for review. I want to add the popup window which should cover whole page but it is only covering the section I have added to. 
Here is the screenshot of it , if anyone can help it would be great

Mohit_garg_0-1698237244436.png

 

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