def set_run_style(validator, attr, value)
      return unless INLINE_STYLES.include?(attr.to_sym)
      Axlsx.send(validator, value) unless validator.nil?
      self.instance_variable_set :"@#{attr.to_s}", value
    end
def set_run_style(validator, attr, value)
      return unless INLINE_STYLES.include?(attr.to_sym)
      Axlsx.send(validator, value) unless validator.nil?
      self.instance_variable_set :"@#{attr.to_s}", value
    end
Utility method for setting inline style attributes