How to remove secondary menu drop down in mobile mode

I am trying to remove the secondary menu from the mobile format. Please let me know what CSS needs to be removed to complete this.

Thanks!!
http://www.sportspagebarkihei.com/

Hi there, I just had mine fixed just now. If you go to "top.php" and look for <?php smt_mobile_menu('sec-menu'); ?> and just change to
<!---<?php smt_mobile_menu('sec-menu'); ?>---!>

I had both of mine removed as they don't work on mobile device. Not sure why ...