Button icon problem


I would like to add a icon to my button but unfortunately couldn’t manage. Would you please help me?

Icon doesn’t display.

Best Regards.

Here is my html portion:

<ion-content ng-controller="ExampleController" padding="true">
        <button class="button icon-right ion-ios-camera" ng-click="takePhoto()">
            Take Photo


Should I add a css in the header?

Most probably icons does NOT support IOS 9.1!

changed the path of css and it worked!