Hi,   I have some fairly simple tweens with timelineLite like this .fromTo('.circle-top', .5, {left: 268, top: 155, opacity:0}, {css:{left: 337, top: 83, opacity:1}, ease: Circ.easeOut }, "-=.5") .fromTo('.circle-bottom', .5, {left: 418, top:22, opacity:0}, {css:{left: 348, top: 92, opacity:1}, ease: Circ.easeOut }, "-=.25") And the width of my container is 760 pixels wide, so the animation is always centered with CSS until I reach 760px wide in my browser. Then when the browser resizes t