Text Width After Removing Sidebar with WooSideBars

Hi there. I am using the Astrid theme. I chose the theme so that I could have a sidebar on the first page. I have since decided that I don’t want the sidebar (on any page) so I have removed it. When I originally removed the sidebar from all other pages (except the front page), the text width did not adjust to the full width of the page (computer display). How do I adjust it so that the text fills the page on all pages. I am assuming that this is a CSS code issue.

I would appreciate any help.

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