This snippet by Paresh Deshpande is useful when you want to reveal the sub menu in you card UI section. When you click on the plus icon, it pushes the content to reveal a sub menu that is hidden away offering new options.
If you are having trouble with the pen, try the archived copy on GitHub
+ – Menu Snippet
See the Pen Image Sharing App Concept – Plus Button Expanded by Paresh Deshpande (@pareshd) on CodePen.0