cls

An optional CSS class to apply to the main rendering element of the Switch.
The properties in this class will override any control and theme-specific properties.

<input id="switch" type="checkbox" />

<style>
    .custom { width:200px; }
</style>

<script type="text/javascript">
    $(function () {
        $("#switch").shieldSwitch({
            cls: "custom"
       });
    });
</script>