ScrollMagic helps you to easily react to the user's current scroll position. It's the perfect library for you, if you want to ... animate based on scroll position – either trigger an animation or synchronize it to the scrollbar movement (like a playback scrub control). pin an element starting at a specific scroll position – either indefinitely or for a limited amount of scroll progress (sticky ele
![ScrollMagic](https://cdn-ak-scissors.b.st-hatena.com/image/square/4d3d13b9626292c1b89f73350c228ee781c500af/height=288;version=1;width=512/http%3A%2F%2Fscrollmagic.io%2Fassets%2Fimg%2Fdemo_fb_preview.jpg)