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diff --git a/lib/axlsx/stylesheet/fill.rb b/lib/axlsx/stylesheet/fill.rb
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+module Axlsx
+  # The Fill is a formatting object that manages the background color, and pattern for cells.
+  # @note The recommended way to manage styles in your workbook is to use Styles#add_style.
+  # @see Styles#add_style
+  # @see PatternFill
+  # @see GradientFill
+  class Fill
+
+    # The type of fill
+    # @return [PatternFill, GradientFill]
+    attr_accessor :fill_type
+
+    # Creates a new Fill object
+    # @param [PatternFill, GradientFill] fill_type 
+    # @raise [ArgumentError] if the fill_type parameter is not a PatternFill or a GradientFill instance
+    def initialize(fill_type)
+      self.fill_type = fill_type
+    end
+
+    # Serializes the fill
+    # @param [Nokogiri::XML::Builder] xml The document builder instance this objects xml will be added to.
+    # @return [String]
+    def to_xml(xml)
+      xml.fill { @fill_type.to_xml(xml) }
+    end
+
+    def fill_type=(v) DataTypeValidator.validate "Fill.fill_type", [PatternFill, GradientFill], v; @fill_type = v; end
+
+
+  end
+end