how to show an article with no white background

<!-- This simple flow document includes a paragraph with some
     bold text in it and a list. -->
<flowdocumentreader xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation">
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <flowdocument>
    <paragraph>
      <bold>Some bold text in the paragraph.</bold>
      Some text that is not bold.
    </paragraph>

    <list>
      <listitem>
        <paragraph>ListItem 1</paragraph>
      </listitem>
      <listitem>
        <paragraph>ListItem 2</paragraph>
      </listitem>
      <listitem>
        <paragraph>ListItem 3</paragraph>
      </listitem>
    </list>

  </flowdocument>
</flowdocumentreader>

<window>
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Microsoft_Windows_Themes="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity" xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d"
x:Class="Christmas.MainWindow" x:Name="Window" Title=" MainWindow" Width="Auto" Height="Auto" WindowStyle="None" AllowsTransparency="True"
ResizeMode="CanResizeWithGrip" Background="{x:Null}"> 
	
	<grid x:name="LayoutRoot" height="Auto" width="Auto" xmlns:x="#unknown">
		
		<!--here ı put 1 Button ClickEvent  will close window-->
		<Button Content="Close me" Click="button1_Click" HorizontalAlignment="Right" Width="56" OpacityMask="#FF76FF00" Height="40" VerticalAlignment="Top" >
			<Button.Background>
				<lineargradientbrush endpoint="0.5,1" startpoint="0.5,0">
					<gradientstop color="Black" offset="0" />
					<gradientstop color="#FFFF0086" offset="1" />
				</lineargradientbrush>
			</Button.Background>
		</Button>
		
		<!--here you can put your article -->
		<richtextbox margin="0,0,176,-1" background="{x:Null}" borderbrush="#FF76FF00" foreground="#FF76FF00" selectionbrush="#FF76FF00" isreadonlycaretvisible="True" fontsize="16" fontfamily="Monotype Corsiva" d:layoutoverrides="GridBox" xmlns:d="#unknown">
<flowdocument>
<paragraph><run language="tr-tr" text="hello friend wrıte here your article" /></paragraph>
<paragraph><run language="tr-tr" text="*****************************" /></paragraph>
<paragraph><run language="tr-tr" /></paragraph>
<paragraph><run language="tr-tr" /></paragraph>
<paragraph><run language="tr-tr" /></paragraph>
<paragraph><run language="tr-tr" /></paragraph>
<paragraph><run language="tr-tr" text="**************************************************************" /></paragraph>
<paragraph><run language="tr-tr" text="**********************************" /></paragraph>
<paragraph><run language="tr-tr" text="**********************************************" /></paragraph>
<paragraph><run language="tr-tr" text="******************************" /></paragraph>
<paragraph><run language="tr-tr" text="************************************" /></paragraph>
<paragraph><run language="tr-tr" text="*********" /></paragraph>
<paragraph><run language="tr-tr" text="*************************" /></paragraph>
<paragraph><run language="tr-tr" text="*************" /></paragraph>
<paragraph><run language="tr-tr" text="************************************************************************************************************************************************************" /></paragraph>
</flowdocument>
	</richtextbox>
	<!--here ı put path  you can resize window at Rıght bottom-->
	<path data="M55.5,0.5 L55.5,39.5 0.5,39.5 z" horizontalalignment="Right" height="40" margin="0,0,0,-1" stretch="Fill" stroke="Black" verticalalignment="Bottom" width="40" panel.zindex="-1" grid.row="1">
	<path.fill>
		<lineargradientbrush endpoint="0.5,1" startpoint="0.5,0">
			<gradientstop color="Black" offset="0" />
			<gradientstop color="#FFCD006C" offset="1" />
		</lineargradientbrush>
	</path.fill>
	</path>		
</grid>
</window>
<!--here is what you will put at codebehind for button clickhandler-->
<!--
	
	private void button1_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

-->