is: 'hero-animation',

    behaviors: [
      Polymer.NeonSharedElementAnimationBehavior
    ],

    configure: function(config) {
      var shared = this.findSharedElements(config);
      if (!shared) {
        return;
      }

      var fromRect = shared.from.getBoundingClientRect();
      var toRect = shared.to.getBoundingClientRect();

      var deltaLeft = fromRect.left - toRect.left;
      var deltaTop = fromRect.top - toRect.top;
      var deltaWidth = fromRect.width / toRect.width;
      var deltaHe