angularjs - Issue with Angular Material -

i trying demo angular material tool bar. default code js not having dependent modules. code looks below

angular.module('myapp')  .controller('appctrl', function($scope) {  });

but if add new module or empty square braces below, not working

angular.module('myapp',[])  .controller('appctrl', function($scope) {  });

if remove it, working. how can add module without affecting material design ?

the link plunker here

you need add ngmaterial angular app this:

angular.module('myapp',['ngmaterial']);

here working plunker

YU