How to custom width for a specific category in homepage

I wanted to create a different content amount on my homepage for a specific category.
I update the archive php on my child theme to have entire content for a specific category.

The problem is that my homepage is not showing the preview in full width but only half of it.
I assume the change need to be in the custom CSS but not sure how to do it.

Here is my site: https://yomanchic.com
I am using vogue theme.
The category_id=521 which I am trying to customize.
In my homepage you can see it under: Welcome to YomanChic –> just above the footer.

I want it to be adjusted same like any other post and not on preview.

Thanks,
Sharon