cls

cls - An optional CSS class to add to the tagcloud element.

<div id="tags" />

<style>
    .myclass {
        display: inline-block;
        min-width: 200px;
        max-width: 600px;
        margin: auto;
    }
</style>

<script type="text/javascript">
    jQuery(function ($) {
        $("#tags").shieldTagCloud({
            cls: "myclass",
            dataSource: {
                data: tagList
            }
        });
    });
</script>