meteor__microscope/client/templates/application/layout.js

Template.layout.onRendered(function () {
  this.find('#main')._uihooks = {
    insertElement: function (node, next)  {
      $(node).hide().insertBefore(next).fadeIn();
    },

    removeElement: function (node) {
      $(node).fadeOut(function () {
        this.remove();
      });
    }
  };
});