How to make Product Grid width 80% of screen size

Store Design
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1

How do I make a Product Grid’s width 80% of the screen size with custom CSS?

The CSS should go directly into the custom CSS field on the Product Grid and not in the theme CSS itself.

2

Hi @Nyanko ,
Can you kindly share your store link (with the password, if any) with us? We will check it and suggest you a solution if possible.