.region-content .view-group-nodes .btn-group ul li:before {    
  content: none; 
  }

.view-group-nodes .btn-group .dropdown-menu > li > a {
  display: block;
  padding: 3px 5px;
  clear: both;
  font-weight: normal;
  line-height: 1.428571429;
  color: #333333;
  white-space: nowrap;
  border-bottom: 0px;
}