message: style(Cell): adjust cell label margin to 4px
diff: @cell-label-color: @gray-6;
  @cell-label-font-size: @font-size-sm;
  @cell-label-line-height: 18px;
  -@cell-label-margin-top: 3px;
  +@cell-label-margin-top: @padding-base;
  @cell-value-color: @gray-6;
  @cell-icon-size: 16px;
  @cell-right-icon-color: @gray-6;
  