inabox/InABox.Avalonia/Theme/Classes/Separator.axaml

<Styles xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

    <Style Selector="Separator">
        <Setter Property="BorderBrush" Value="{DynamicResource SystemChromeGrayColor}" />
        <Setter Property="BorderThickness">
            <Setter.Value>
                <DynamicResource ResourceKey="PrsBorderThickness" />
            </Setter.Value>
        </Setter>
        <Setter Property="Margin" Value="{DynamicResource PrsControlSpacing}" />
        <Setter Property="MinHeight" Value="10" />
        <Setter Property="HorizontalAlignment" Value="Stretch" />
    </Style>


</Styles>