A little snippet for WordPress. Paste this in the header.php
<? if (!is_home()) { ?> <script> jQuery(document).ready(function() { if( window.innerWidth < 700 ) { $('html,body').animate({scrollTop: $("#mobile_menu_end").offset().top},'slow'); } }); </script> <? } ?>
Then place this IDed div below your menu.
<div id="mobile_menu_end"></div>