.treeview {

}

.tree_item {
  font-family: sans-serif;
  font-weight: bold;
  background: white;
  padding: 4px;
  margin: 1px;
  
  cursor: pointer;
}

.tree_item:hover {
  background: #D1D1FA;
}

.tree_item_children {
  margin-left: 8px;
  display: none;
}