message: fix(datatable): upgraded expressive styling
diff: height: rem(20px);
  width: rem(20px);
  }
  + .bx--toolbar-search-container-expandable .bx--search .bx--search-magnifier {
  + height: var(--cds-layout-04, 3.25rem);
  + width: var(--cds-layout-04, 3.25rem);
  + }
  + .bx--btn .bx--btn__icon {
  + height: rem(20px);
  + width: rem(20px);
  + }
  + th.bx--table-expand + th.bx--table-column-checkbox {
  + padding-left: 0.75rem;
  + }
  }
  