I customized the CSS based on the WordPress Classic theme, mostly by trial and error since I know nothing about CSS. Everything works except that the sidebar (with the calendar, archives listing, etc.) blocks post content on screens smaller than 15". Is there a way to remove the sidebar from single post pages?
(There are instructions online about editing the single.php file, but I don't seem to have one of those, or can't find it.)
The blog I need help with is cohn17.com.