[element-plus] el-tree 父节点展开后，子节点有白背景色的bug

<el-tree
	:data="treedata"
	highlight-current
	:props="defaultProps"
></el-tree>

.el-tree {
  background: transparent;
  .el-tree-node:focus > .el-tree-node__content {
 	 background-color:transparent;
  }
  .el-tree-node:focus > .el-tree-node__children {
    background-color:transparent;
  }
  .el-tree-node.is-current > .el-tree-node__content {
    background-color:  transparent;
  }
}
 

参考：

Element-UI tree 组件 点击后高亮显示的样式修改(背景色)