❔ WPF DataGrid RowStyle DataTrigger - Doesn't Keep Default Theme

<DataGrid
    AutoGenerateColumns="False"
    ItemsSource="{Binding People}"
    CanUserAddRows="False">
    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow">
            <Style.Triggers>
                <DataTrigger Binding="{Binding FirstName}" Value="Alice">
                    <Setter
                        Property="Background" Value="LightSkyBlue"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    </DataGrid.RowStyle>
    <DataGrid.Columns>
        <DataGridTextColumn
            Header="First Name"
            Binding="{Binding FirstName}" />
        <DataGridTextColumn
            Header="Last Name"
            Binding="{Binding LastName}" />
        <DataGridTextColumn
            Header="Full Name"
            Binding="{Binding FullName}" />
    </DataGrid.Columns>
</DataGrid>