.dropdown-submenu {
   position: relative;
}

   .dropdown-submenu > .dropdown-menu {
      top: 0;
      left: 100%;
      margin-top: -6px;
      margin-left: -1px;
      -webkit-border-radius: 0 6px 6px 6px;
      -moz-border-radius: 0 6px 6px 6px;
      border-radius: 0 6px 6px 6px;
   }

   .dropdown-submenu:hover > .dropdown-menu {
      display: block;
   }

   .dropdown-submenu > a:after {
      display: block;
      content: " ";
      float: right;
      width: 0;
      height: 0;
      border-color: transparent;
      border-style: solid;
      border-width: 5px 0 5px 5px;
      border-left-color: #cccccc;
      margin-top: 5px;
      margin-right: -10px;
   }

   .dropdown-submenu:hover > a:after {
      border-left-color: #ffffff;
   }

   .dropdown-submenu.pull-left {
      float: none;
   }

      .dropdown-submenu.pull-left > .dropdown-menu {
         left: -100%;
         margin-left: 10px;
         -webkit-border-radius: 6px 0 6px 6px;
         -moz-border-radius: 6px 0 6px 6px;
         border-radius: 6px 0 6px 6px;
      }