PDFOffice_Windows_exe/PDF Office/Styles/SeparatorStyle.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Style
        x:Key="VerticalSeparatorStyle"
        BasedOn="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}"
        TargetType="{x:Type Separator}">
        <Setter Property="Background" Value="{StaticResource color.sys.layout.divider}" />
        <Setter Property="Height" Value="16" />
        <Setter Property="Width" Value="1" />
        <Setter Property="HorizontalAlignment" Value="Stretch" />
        <Setter Property="Margin" Value="12,0" />
    </Style>

    <Style
        x:Key="HorizontalSeparatorStyle"
        BasedOn="{StaticResource {x:Static ToolBar.SeparatorStyleKey}}"
        TargetType="{x:Type Separator}">
        <Setter Property="Background" Value="{StaticResource color.sys.layout.divider}" />
        <Setter Property="Height" Value="1" />
        <Setter Property="HorizontalAlignment" Value="Stretch" />
        <Setter Property="Margin" Value="8,4" />
    </Style>
</ResourceDictionary>