RichTextBox with better spacing

It took a bit of looking around today to figure out how to create a resource file entry to style my RichTextBox so that it doesn't have ridiculous spacing. I found this, which shows how to do it inside the page or window. However, I wanted to put it in a resource file so that I could reuse it. I finally came up with this:

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style x:Key="RichTextWithBetterSpacing" TargetType="{x:Type RichTextBox}">
        <Setter Property="FontSize" Value="12"/>
        <Setter Property="FontFamily" Value="Arial"/>
        <Style.Resources>
            <Style TargetType="{x:Type Paragraph}">
                <Setter Property="Margin" Value="0"/>
            </Style>
        </Style.Resources>                
    </Style>
</ResourceDictionary>