message: Add className for td in react matrix
diff: @@ -148,7 +148,7 @@ export class SurveyQuestionMatrixRow extends ReactSurveyElement {
  );
  } else {
  td = (
  - <td key={key} headers={column.locText.renderedHtml}>
  + <td key={key} headers={column.locText.renderedHtml} className={this.question.cssClasses.cell}>
  <label className={itemClass}>
  <input
  id={inputId}
  