MktoForms2 :: Lightbox onClick

HTML

<script src="//app-sj01.marketo.com/js/forms2/js/forms2.min.js"></script>
<form id="mktoForm_116"></form>
<button class="lightboxButton" onclick="
    MktoForms2.loadForm('//app-sj01.marketo.com', '410-XOR-673', 116,
    function(form) { MktoForms2.lightbox(form).show(); });">
  Click me
</button>

CSS

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

BUTTON.lightboxButton {
  border: 2px outset white;
  background-color: white;
  padding: 4px;
  border-radius: 4px;
}