Print Style Sheet Not Working

Howdy WP efficianados!

I’m using the 1024px theme (https://andreasviklund.com/blog/webdesign/1024px-theme-for-wordpress/)
and doing my darndest to add a print stylesheet so that it doesn’t print the sidebar, looks nice when printed, etc. etc.

For some reason the style sheet doesn’t seem to be taking effect. I have linked it correctly, using the Firefox Web Developer plugin I can both see that it’s registering and I can display it in the browser using the print stylesheet and it looks correct.

However, when I go to print preview or actually try to print it, it basically retains the normal stylesheet.

Oddly enough, if I set declare only body {display:none;} it does just that (for testing purposes I was attempting to see if the stylesheet was really taking effect at all.

So I’m baffled at this point – any ideas would be GREATLY appreciated!