How can I solve this COnflict issue?

I am trying to use a custom button for Webinarjam registrations. I have placed the embed code in a stripped down WordPress site but it still won’t open in a lightbox. It just opens with the content area. How can i solve this conflict and get the button to work properly?

Thanks,

Rich

http://webinar.unbeatablesite.wpengine.com/

user: **********

password: **********

Staff Note: Credentials removed for security purpose.