.tree-view{overflow-y:hidden}.tree-view_children{margin-left:16px}.tree-view_children-collapsed{height:0}.tree-view_arrow{cursor:pointer;margin-right:6px;display:inline-block;-webkit-user-select:none;-moz-user-select:none;user-select:none}.tree-view_arrow:after{content:"▾"}.tree-view_arrow-collapsed{transform:rotate(-90deg)}