var request = null;
    var mouse = { x: 0, y: 0 };
    var cx = window.innerWidth / 2;
    var cy = window.innerHeight / 2;

    $('html').mousemove(function(event) {

        mouse.x = event.pageX;
        mouse.y = event.pageY;

        cancelAnimationFrame(request);
        request = requestAnimationFrame(update);
    });

    function update() {

        dx = mouse.x - cx;
        dy = mouse.y - cy;

        tiltx = (dy / cy);
        tilty = - (dx / cx);
        radius = Math.sqrt(Math.pow(tiltx,2) + Math.pow(tilty,2));
        degree = (radius * 15);
        TweenLite.to("#container", 2, {transform:'rotate3d(' + tiltx + ', ' + tilty + ', 0, ' + degree + 'deg)', ease:Power2.easeOut});
    }

    $(window).resize(function() {
        cx = window.innerWidth / 2;
        cy = window.innerHeight / 2;
    });