var controller = new ScrollMagic.Controller();
var stagger = TweenMax.staggerTo('.header-triangle', 1, {
opacity: 0,
y: '100%',
ease: Power4.easeInOut
},
0.02);
new ScrollMagic.Scene({triggerElement: "#header-triangles", triggerHook: "onLeave"})
.setTween(stagger)
.addTo(controller)