Hi there, Forever comes with a full-width template for pages, which you can select in the Page attributes menu:
https://cl.ly/image/283Y1o151e0Z
If you’re trying to widen the width of the main column on the blog page, that column has the #primary ID. You can alter the width by using CSS.
The best way to make changes to a theme is to use a child theme, so your changes won’t be overwritten when you update the theme. Here are some guides in case you haven’t made one before:
https://codex.www.ads-software.com/Child_Themes
https://op111.net/53/
https://vimeo.com/49770088
If you’re only making CSS changes and not editing other theme files, you could instead just use the Jetpack plugin’s CSS module.
Just let me know if you need further help, and provide a link to your site.
