GSAP 추가하기

• GSAP 공식사이트
  https://greensock.com/docs/v3/Installation
• cdnjs
  https://cdnjs.com/libraries/gsap

샘플

https://greensock.com/scrollmagic/

!codepen [PointC/embed/dBdogo?default-tab=html%2Cresult]