How to fix this layout issue in JQuery Mobile

I created a popup with a listview inside. I also applied a list filter. However, it is not correctly formatted. Is there any way I can push it up a bit (like a list divider would be)?

EDIT: the code

<div data-role="content">
  <div data-role="popup" id="popupMenu" data-theme="d">
    <ul data-role="listview" data-inset="true" id="symptomslist" style="min-width:210px;" data-theme="d" data-filter="true">
    </ul>
  </div>
</div>

To get best results of jQuery Mobile styles of contents inside page, dialog, panel or popup, always place them inside data-role="content".

<div data-role="popup" id="popupMenu" data-theme="d">
  <div data-role="content">
    <ul data-role="listview" data-inset="true" data-theme="d" data-filter="true">
      <!-- list items -->
    </ul>
  </div>
</div>

Demo