Scroll + pinch zoom not working when ionic.css used?

Hello,

I have a page scrollable, and pinch zoomed.

See my short example :

<head>
	<meta charset="utf-8">
	<meta name="viewport" content="initial-scale=0.1, maximum-scale=1, minimum-scale=0.1, width=device-width">
	<title>Test</title>
	<!--link href="lib/ionic/css/ionic.css" rel="stylesheet"-->
	<script src="lib/ionic/js/ionic.bundle.js"></script>
	<style>
	div {
		border	: 1px solid #f00;
		height	: 100px;
		float		: left;
		margin	: 10px;
		width		: 100px;
	}
	</style>
</head>
<body>
	<ion-scroll zooming="true" direction="xy">
		<div>Hello World !</div><div>Hello World !</div><div>Hello World !</div><div>Hello World !</div><div>Hello World !</div><div>Hello World !</div><div>Hello World !</div><div>Hello World !</div><div>Hello World !</div><div>Hello World !</div><div>Hello World !</div><div>Hello World !</div>
		<br/><br/><br/><br/><br/><br/><br/>Floating divs or whatever HTML content is there
	</ion-scroll>
</body>
</html>

The scroll and zoom seems ok, but when I activate the “lib/ionic/css/ionic.css” I no longer can zoom on pinch.

Please, do you have any idea ?

Regards.

Tiou