How can I give Online Content and Hot Stuff background color?

Greetings again,

I thought I would post the markup generated from the sidebar menu we are currently using with the hope it will bring more clarity to the issue we are having.

There is the child sidebar called HR. We used the widget css style to give it a background color.

However, we have also have another child underneath purchasing child sidebar and we would like these to have background color as well. These are Online Content and Hot Stuff.

Any ideas how to generate the background code from the markup below?

 <div id="advanced_sidebar_menu-8-wrap" data-js="advanced_sidebar_menu-8-wrap">
      <ul class="child-sidebar-menu">
       <li class="page_item page-item-2867 page_item_has_children current_page_item has_children"><a href="http://domain/depts/?page_id=2867">HR</a>
        <ul class="children">
   <li class="page_item page-item-5125 page_item_has_children has_children"><a href="http://domain/depts/?page_id=5125">Online Content</a>
     <ul class="children">
  <li class="page_item page-item-2895"><a href="http://domain/depts/?page_id=2895">Descriptions</a></li>
  <li class="page_item page-item-2911"><a href="http://domain/depts/?page_id=2911">Oracle</a></li>
  <li class="page_item page-item-2917"><a href="http://domain/depts/?page_id=2917">Contracts</a></li>
  <li class="page_item page-item-2927"><a href="http://domain/depts/?page_id=2927">Procedures</a></li>
  <li class="page_item page-item-2960"><a href="http://domain/depts/?page_id=2960">Forms</a></li>
  <li class="page_item page-item-2936"><a href="http://domain/depts/?page_id=2936">Special Notices</a></li>
  <li class="page_item page-item-2943"><a href="http://domain/depts/?page_id=2943">FAQ</a></li>
  <li class="page_item page-item-5118"><a href="http://domain/depts/?page_id=5118">Client Items</a></li>
      </ul>
   </li>
   <li class="page_item page-item-5123 page_item_has_children has_children"><a href="#">Hot Stuff</a>
     <ul class="children">
  <li class="page_item page-item-3460"><a href="http://domain/depts/pdf/PurchasingRestricted.pdf" target="_blank">Restricted Item s</a></li>
  <li class="page_item page-item-5120"><a href="http://domain/depts/pdf/UpgradeAwareness.pdf" target="_blank">Documentation</a></li>
     </ul>
          </li>
        </ul>
       </li>
     </ul><!-- End .child-sidebar-menu -->
    </div>