def parse(node)
      @color1 = Color.new(parent: self).parse_hex_string(node.attribute('color').value)
      node.xpath('v:background').each do |second_color|
        @size = second_color.attribute('targetscreensize').value.sub(',', 'x') unless second_color.attribute('targetscreensize').nil?
        second_color.xpath('*').each do |node_child|
          case node_child.name
          when 'fill'
            @fill = Fill.new(parent: self).parse(node_child)
          end
        end
      end
      self
    end
def parse(node)
      @color1 = Color.new(parent: self).parse_hex_string(node.attribute('color').value)
      node.xpath('v:background').each do |second_color|
        @size = second_color.attribute('targetscreensize').value.sub(',', 'x') unless second_color.attribute('targetscreensize').nil?
        second_color.xpath('*').each do |node_child|
          case node_child.name
          when 'fill'
            @fill = Fill.new(parent: self).parse(node_child)
          end
        end
      end
      self
    end
Parse DocumentBackground object
 @param node [Nokogiri::XML:Element] node to parse
 @return [DocumentBackground] result of parsing