xenon-field-group.html

<link rel="import" href="../polymer/polymer.html"/>
<dom-module id="xenon-field-group">
    <template>
        <style>
           #group { display:flex; flex-wrap:wrap; margin-right:-8px; }
           #group::content > * { flex: 1 1 290px; margin:0px 8px 0px 0px; }
        </style>
        <div id="group"><content></content></div>
    </template>
    <script>
    Polymer({
        is:"xenon-field-group"
    });
    </script>
</dom-module>