MktoForms2 :: Lightbox :: Remove Close X

HTML

<script src="//app-aba.marketo.com/js/forms2/js/forms2.min.js"></script>

<form id="mktoForm_1043"></form>

<script>
var mktoInstance = '//app-aba.marketo.com',
    munchkinId = '648-VJF-461',
    formId = 1043;

 MktoForms2.loadForm(mktoInstance, munchkinId, formId,
    function (form){
        var formEl = form.getFormElem()[0],        
            lightbox = MktoForms2.lightbox(form).show(),
            closeEl = document.querySelector('.mktoModalClose');

                
    });
 
</script>