#toolbar-item-workbench-tray{
  background-color: #212121 !important;
}

#toolbar-item-workbench-tray .toolbar-menu{
  background-color: #212121 !important;
  color: #fafafa !important;
}

#toolbar-item-workbench-tray .toolbar-menu li a{
  background-color: #212121 !important;
  color: #fafafa !important;
}