Button with Rounded Corners in WPF

First Created a Style

<Style x:Key="RoundButtonTemplate" TargetType="Button">

        <Setter Property="Background" Value="Brown"/>

        <Setter Property="Foreground" Value="White" />

        <Setter Property="Template">

            <Setter.Value>

                <ControlTemplate TargetType="Button">

                    <Border CornerRadius="15" Background="{TemplateBinding Background}"

                                BorderThickness="1">

                        <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center">

                        </ContentPresenter>

                    </Border>

                </ControlTemplate>

            </Setter.Value>

        </Setter>

    </Style>

Call the style to Respective Button. 

<Button Focusable="False"

        Style="{StaticResource RoundButtonTemplate}"

        Width="264"

       Height="90" 

       Grid.Row="0"

       Margin="0,0,0,0"

       HorizontalAlignment="Center"

       BorderBrush="#FFF"

       Name="PasswordButton"

       Click="PasswordButton_Click"> 

                                             

</Button>