message: refactor: update tree line
diff: @@ -64,7 +64,7 @@ $fontColor: #383e47 !default;
  }
  &__indent {
  - width: 16px;
  + width: 24px;
  height: 100%;
  display: inline-block;
  }
  @@ -80,7 +80,7 @@ $fontColor: #383e47 !default;
  width: 50%;
  height: 1px;
  background-color: #999;
  - left: 50%;
  + left: calc(50% - 4px);
  top: 50%;
  }
  }
  