This is really epic effect designed by Nathan Taylor, you have two info cards that shows an image, title and description, it will work great for blog archive pages and other such layouts. The cards transition with a mesmerizing parallax effect.
If you are having trouble with the pen, try the archived copy on GitHub
Parallax Animated Card UI Snippet
See the Pen Info Cards by Saijo George (@SaijoGeorge) on CodePen.0