Responsive sticky box, is at top for wide devices and bottom for smaller devices. The fallback is unsticky for browser not supporting position: sticky. Notice how the shadow appears/disappears on scrolling. Tested on Chrome, Safari, Firefox, Opera, iOS, Android. Does not work on IE11, Edge.
Author: Kunuk Nykjær
Live Demo: View The Demo
Download Link: Download The Source Code
Official Website: https://codepen.io/kunukn/pen/pWVdZq