CSS issue: How to prevent div moving out of position when scrolling

Using css: CSS issue: How to prevent div moving out of position when scrolling on newest questions tagged css – Stack Overflow

CSS newb here. I’m modifying the CSS of a blog template, but I’ve run into an issue where the divs containing the blog title/comments/tags will move out of their original position when scrolling down the page. I’ve tried many attempts to make it so that they’d always retain their original position, but I haven’t been successful yet. Any input/suggestions would be greatly appreciated.

Blog: http://cargocollective.com/havnode-blog

Thanks in advance!

source: http://stackoverflow.com/questions/11147227/css-issue-how-to-prevent-div-moving-out-of-position-when-scrolling
Using css: using-css