Why the scrolling in not working (why list is not scrolling)

I am trying to make one demo in which when user type in text field it show the list.It look like auto complete in when user type in text field it show the filter list .But my issue is my list is not scrolling .I already use overflow :auto ; or overflow :scroll .But nothing work for me .could you please tell me how to scroll the list ?

.listcontainer{
  overflow: auto;
  border :1px solid blue;
  height:150px;

}

<div class="listcontainer" ng-show="station.stationCode">
    <li class="item" ng-repeat="station in data.data | filter:station.stationCode:startsWith">{{station.stationName+"-("+station.stationCode+")"}}</li>
</div>