Custom Forms

Hi (again! :)),
I tried following form code to give my join button a little customization.

<form id="cta-form" class="" name="cta-form" method="post" action="">
<input type="hidden" name="meetingID" id="meetingID" value="xxxxxxxxxxxx">
<button type="submit" class="ow-button-hover">
    <i class="fa fa-angle-double-right"></i> Get Help NOW!
</button>
</form>

It follows the signature of form generated by the shortcode, except for replacement of button type=submit and form id. And it doesn’t work.
Do I need to provide action attribute? or add some extra hidden value in form?

Thank you for your kind support and everything else you have done with BBB.

https://wordpress.org/plugins/bigbluebutton/