A container that is always square
bower install polito-quadradiv
<html>
<head>
<script src="../../webcomponentsjs/webcomponents-lite.min.js"></script>
<link rel="import" href="../../polymer/polymer.html" />
<link rel="import" href="../polito-quadradiv.html" />
<style>
polito-quadradiv {
background-color: red;
width: 150px;
}
</style>
</head>
<body unresolved>
<polito-quadradiv>
I'm quadradiv!
</polito-quadradiv>
</body>
</html>