<html>
<head>
<style id="s">
.container {
height: 30px;
}
</style>
<style>
.overflow {
height: 150px;
border: 1px silver solid;
}
body {
height: 60px;
width: 300px;
-moz-column-width: 50px;
-moz-column-gap: 1px;
-moz-column-fill: auto;
}
</style>
</head>
<body onload="s=document.getElementById('s'); s.parentNode.removeChild(s);">
<div class="container"><div class="overflow"></div></div>
<div class="container"><div class="overflow"></div></div>
</body>
</html>