index.less

.basic-tree {
  position: relative;

  &-title {
    display: inline-block;
    width: 100%;
    padding-right: 10px;

    .basic-tree__action {
      display: none;
      float: right;
    }

    &:hover {
      .basic-tree__action {
        display: inline-block;
      }
    }
  }
}