I came up with a way to tween a centered, fixed element out of view without "dead pixels". So when the animation starts you can immediately see it.
var tl = TweenMax.fromTo(".box", 2,
{ transform: "translateY(50vh) translateY(50%)" },
{ transform: "translateY(-50vh) translateY(-50%)" }
);
For some context: http://dumbo.design/airberlin – scroll to the first "chapter intro" > the laptop mockup (Wanted to show you guys the site when it's truly finished, argh) – 75% perce