MktoForms2 :: Switch Thank You URL

HTML

<script src="//app-sj03.marketo.com/js/forms2/js/forms2.min.js"></script>
<form id="mktoForm_1240"></form>
<script>
    MktoForms2.loadForm("//app-sj03.marketo.com", "370-TGX-095", 1240);
</script>

CSS

BODY {
    background-image:url(http://placekitten.com/g/200/300);
}