el-tree固定大小时，超出部分设置滚动条

<el-tree
	ref="tree"
	:highlight-current="true"
	:props="treeProps"
	:data="treeData"
	:render-content="renderContent"
	:filter-node-method="filterNode"
	@current-change="treeSelect"
></el-tree>
//css样式代码
.el-tree {
  min-width: 100%;
  display: inline-block;
}
.tree {
  overflow:auto;
  max-height: 200px;
}

效果图如下：