docs: public StyleSet setBackgroundColor(IndexedColors backgroundColor, boolean withHeadCell) {
  		if (withHeadCell) {
  			StyleUtil.setColor(this.headCellStyle, backgroundColor, FillPatternType.SOLID_FOREGROUND);
  		}
  		StyleUtil.setColor(this.cellStyle, backgroundColor, FillPatternType.SOLID_FOREGROUND);
  		StyleUtil.setColor(this.cellStyleForNumber, backgroundColor, FillPatternType.SOLID_FOREGROUND);
  		StyleUtil.setColor(this.cellStyleForDate, backgroundColor, FillPatternType.SOLID_FOREGROUND);
  		return this;
  	}