A pretty cool image gallery designed by Nikolay Talanov. There are five images in a column like layout, on hover you see the number overlayed on the image. When you click on it the image expands and takes the full width of 5 columns. This is a great animation for a hero section image slider.
If you are having trouble with the pen, try the archived copy on GitHub
See the Pen Cool Layout with Complex Chainable Animation by Nikolay Talanov (@suez) on CodePen.0