for (const [start, end] of inViewportAndBoundaries) {
      const cell = this.addLabelCell();
      cell.style.top = `${marginTop}px`;
      cell.style.left = calculatePositionValueForDayCount(vp, start.diff(startView, 'days'));
      cell.style.width = calculatePositionValueForDayCount(vp, end.diff(start, 'days') + 1);