Change collapsible div color

Change collapsible div color

i want to change  collapsible div and listview color
i gave style but the color does not change what should i do?

  1.  <div data-role="collapsible"  data-collapsed="false">
  2.            <h3 style="background: rgba(204,244,204,0.9);">Hotel Ibrahim Pasha </h3>
  3.  <ul id="listeu"  data-role="listview" data-theme="b" data-inset="true"  >
  4.     </div>