docs: public StyleSet setBorder(BorderStyle borderSize, IndexedColors colorIndex) {
  		StyleUtil.setBorder(this.headCellStyle, borderSize, colorIndex);
  		StyleUtil.setBorder(this.cellStyle, borderSize, colorIndex);
  		StyleUtil.setBorder(this.cellStyleForNumber, borderSize, colorIndex);
  		StyleUtil.setBorder(this.cellStyleForDate, borderSize, colorIndex);
  		return this;
  	}