Responsive improvement

Author: tilwinjoy

demos/alert/demo.html

@@ -6,7 +6,7 @@
   </script>
   <uib-alert ng-repeat="alert in alerts" type="{{alert.type}}" close="closeAlert($index)">{{alert.msg}}</uib-alert>
   <uib-alert template-url="alert.html">A happy alert!</uib-alert>
-  <div class="form-group col-xs-3">
+  <div class="form-group col-xs-6 col-md-3">
     <label>Alert type:</label>
     <select class="form-control" ng-model="alertType">
       <option>success</option>
@@ -15,7 +15,7 @@
       <option>danger</option>
     </select>
   </div>
-  <div class="form-group col-xs-3">
+  <div class="form-group col-xs-6 col-md-3">
     <button type="button" class='btn btn-default' ng-click="addAlert()">Add Alert</button>
   </div>
 </div>