Change the CSS for the elements remaining on that page so fill the empty space – you should be able to use a browser tool like Firebug or Chrome developer tools to find the relevant elements and/or CSS selectors.
If I change the CSS don’t I need to be able to tell if the page is a blog post (where I want the sidebar to appear) or a static page containing artwork (where I don’t want the sidebar space to appear).
(And I have been using Firebug. How did people ever troubleshoot webpages before it came along?)
Good question about Firebug – must have been pretty grim :)!
Most themes output page and/or template specific classes in the body tag – so look there and use that class in the selector for the CSS for that page.
After I posted I remembered a theme where PHP if statements were used to determine how pages were shaped. I was thinking that if the CSS is set to a wider page in style.css I can make an exception for the blog – since the only place I need to make space for the sidebar is on the blog page. The CSS file would include a note as to the existence and location of the exception. My only reservation is that the if statement would have to use an inline style.
<?php
if (is_page('blog')): ?> {
inline CSS to shrink content div to 70%
}
?>
It will have to wait till tomorrow though, it’s late and I’m falling asleep at the keyboard.
ps Couldn’t live without Firebug!!!!! 😉
