Trying to center popover in the center of page.

<!DOCTYPE html>
<html ng-app="myApp">

	<head>
		<meta charset="utf-8" />
		<meta name="viewport" content="initial-scale=1, maximum-scale=1, user-scalable=no, width=device-width" />
		<title>Ionic Framework Example</title>
		<link href="//code.ionicframework.com/nightly/css/ionic.css" rel="stylesheet"/>
		<script src="//code.ionicframework.com/nightly/js/ionic.bundle.js"></script>
		<script src="app.js"></script>
		<link href="style.css" rel="stylesheet">
	</head>

	<body ng-controller="MyController">
	  
     <p>
  <button ng-click="openPopover($event)">Open Popover</button>
     
  <button ng-click="openPopover($event)">Open Popover</button>
     </p>
     
     <script id="my-popover.html" type="text/ng-template">
  <ion-popover-view id="popCss">
    <ion-header-bar>
      <h1 class="title">My Popover Title</h1>
    </ion-header-bar>
    <ion-content>
      Hello!
    </ion-content>
  </ion-popover-view>
</script>

	</body>
</html>

angular.module('myApp', ['ionic'])
.controller('MyController', function($scope, $ionicPopover) {

  // .fromTemplate() method
  var template = '<ion-popover-view><ion-header-bar> <h1 class="title">My Popover Title</h1> </ion-header-bar> <ion-content> Hello! </ion-content></ion-popover-view>';

  $scope.popover = $ionicPopover.fromTemplate(template, {
    scope: $scope
  });

  // .fromTemplateUrl() method
  $ionicPopover.fromTemplateUrl('my-popover.html', {
    scope: $scope
  }).then(function(popover) {
    $scope.popover = popover;
  });


  $scope.openPopover = function($event) {
    $scope.popover.show($event);
  };
  $scope.closePopover = function() {
    $scope.popover.hide();
  };
  //Cleanup the popover when we're done with it!
  $scope.$on('$destroy', function() {
    $scope.popover.remove();
  });
  // Execute action on hide popover
  $scope.$on('popover.hidden', function() {
    // Execute action
  });
  // Execute action on remove popover
  $scope.$on('popover.removed', function() {
    // Execute action
  });
});

#popCss {
    position: fixed !important;
    top: 50% !important;
    left: 50% !important;
    margin-top: -125px !important;
    margin-left: -100px !important;
    height: 250px !important;
    width: 200px !important;
}