Hiya, wondering how to keep the padding on archive pages and such but remove padding on inside of the article (you click on a blog post and it displays).
Your CSS is using margin, but inside-article does NOT have any margin attribute added by default.
So the CSS should not have any effect.
If what you want is to remove padding for all static pages as your topic title, then use a layout element, set the content container width to contain, and set the location to pages > all pages.