.tree-bar{max-height:500px;overflow:auto;margin-top:5px}.tree-bar::-webkit-scrollbar{width:6px;height:6px}.tree-bar::-webkit-scrollbar-thumb{border-radius:4px;-webkit-box-shadow:inset 0 0 2px #d1d1d1;background:#e4e4e4}.ivu-tree .ivu-tree-empty{margin-top:10px;font-size:12px}