I have this integrated GSAP and scrollmagic  scroll animation that is causing me once again headache. I think the best way to animate the slides horizontally is by using Gsap rather then the scrollmagic Option "vertical: false". Now, I'd like to find a way to trigger like scrollmagic does the slides and adding a class for each slide is-active.   I tried the below but doesn't really work.   var headers = ["#section01", "#section02", "#section03", "#section04", "#section