How to show Horizontal and vertical scrollbars without overlapping

<Style TargetType="ScrollViewer">
                <Setter Property="HorizontalScrollMode" Value="Enabled" />
                <Setter Property="VerticalScrollMode" Value="Enabled" />
                <Setter Property="IsHorizontalRailEnabled" Value="True" />
                <Setter Property="IsVerticalRailEnabled" Value="True" />
                <Setter Property="IsTabStop" Value="False" />
                <Setter Property="ZoomMode" Value="Disabled" />
                <Setter Property="HorizontalContentAlignment" Value="Left"/>
                <Setter Property="VerticalContentAlignment" Value="Top"/>
                <Setter Property="VerticalScrollBarVisibility" Value="Visible"/>
                <Setter Property="Padding" Value="0"/>
                <Setter Property="BorderThickness" Value="0"/>
                <Setter Property="BorderBrush" Value="Transparent"/>
                <Setter Property="Background" Value="Transparent"/>
                <Setter Property="Template">
                    <Setter.Value>
                        <ControlTemplate TargetType="ScrollViewer">
                            <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
                                <Grid Background="{TemplateBinding Background}">
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="*"/>
                                        <ColumnDefinition Width="Auto"/>
                                    </Grid.ColumnDefinitions>
                                    <Grid.RowDefinitions>
                                        <RowDefinition Height="*"/>
                                        <RowDefinition Height="Auto"/>
                                    </Grid.RowDefinitions>
                                    <ScrollContentPresenter x:Name="ScrollContentPresenter" Grid.Row="0" Grid.Column="0"
                                                     Grid.RowSpan="2"
                                                Grid.ColumnSpan="2"
 
                                                ContentTemplate="{TemplateBinding ContentTemplate}" 
                                                Margin="{TemplateBinding Padding}" />
                                    <ScrollBar x:Name="VerticalScrollBar"
                                   Grid.Column="1"
                                           Grid.Row="0"
                                   IsTabStop="False"
                                   Maximum="{TemplateBinding ScrollableHeight}"
                                   Orientation="Vertical" IndicatorMode="MouseIndicator"
                                   Visibility="{TemplateBinding ComputedVerticalScrollBarVisibility}"
                                   Value="{TemplateBinding VerticalOffset}"
                                   ViewportSize="{TemplateBinding ViewportHeight}"
                                   HorizontalAlignment="Right"/>
                                    <ScrollBar x:Name="HorizontalScrollBar"
                                   IsTabStop="False"
                                   Maximum="{TemplateBinding ScrollableWidth}"
                                   Orientation="Horizontal" IndicatorMode="MouseIndicator"
                                   Grid.Row="1" Grid.Column="0" 
                                   Visibility="{TemplateBinding ComputedHorizontalScrollBarVisibility}"
                                   Value="{TemplateBinding HorizontalOffset}"
                                   ViewportSize="{TemplateBinding ViewportWidth}" />
                                    <Border x:Name="ScrollBarSeparator"
                                Grid.Row="1"
                                Grid.Column="1"
                                BorderThickness="0,0,1,1"
                                Background="Gray"
                                BorderBrush="Gray" />
                                </Grid>
                            </Border>
                        </ControlTemplate>
                    </Setter.Value>
                </Setter>
            </Style>