A CodePen by Patrick Hildebrandt. Responsive Zipper - Selected content zippers into main content from sidebar.

Instead of all the sidebar content ending up at the bottom of the page.

Much delayed response to http://css-tricks.com/content-folding/

I don't know if this is an issue still or if there's another solution. Just messing around. 

Hoping to make this more customizable (e.g. Specifiying which nth-child of the main content to zipper to, and the number of zipperable sidebar elements per those zipper-to areas.)