lipperOffsetY;
          } else {
            newY = mouseY - slipperHeight / 2 - slipperOffsetY;
          }

          TweenLite.to(slipper, 0.1, {
            left: newX,
            top: newY,
          });
        }

        function mouseDownHandler(e) {
          // Slipper animation: move the slipper and its shadow towards each other
          var slipperDx = Math.round(slipperOffsetX / 2),
            slipperDy = Math.round(slipperOffsetY / 2);
          TweenLite.to(slipperBody, 0.05, {
          