Width of text on page for ~/blog and individual posts only

On my WooCommerce site I want the Product pages and other pages to remain as I have them, and to target ~/blog and the individual articles and bring in the width.

I added this CSS to bring in ~/blog but I cannot figure out how to affect the individual blog posts only without also affecting the rest of the site.

.one-container:not(.page) .inside-article {
    padding: 5px 100px 5px 100px;
}

The site is at Flying Twigs

Thanks in advance,
David