element-ui el-tree 只显示第三级checkbox

#app {
  .el-tree-node__content label.el-checkbox {
    display: none;
  }
  .el-tree-node__children label.el-checkbox {
    display: inline-block;
    margin-left: -5px;
  }
  .el-tree-node {
    .is-leaf + .el-checkbox .el-checkbox__inner {
      display: inline-block;
    }

    .el-checkbox .el-checkbox__inner {
      display: none;
    }
  }
}