createMarker(position) {
    const top = position === 'absolute' ? 3 : -10;
    return (
      '<div ' +
      'class="ol-scale-step-marker" ' +
      `style="position: ${position}; top: ${top}px;"` +
      '></div>'
    );
  }
Creates a marker at given position
@param {'absolute'|'relative'} position The position, absolute or relative
@return {string} The stringified div containing the marker