<Button Style="{StaticResource btnToggle1}" Canvas.Left="100" Canvas.Top="200" x:Name="btnMyButton" Content="Test" />

<Style x:Key="btnToggle1" TargetType="Button">
    <Setter Property="Width" Value="50" />
    <Setter Property="Height" Value="30" />
    <Setter Property="Background" Value="Yellow" />
    <Setter Property="Foreground" Value="Green"/>
    <Setter Property="BorderBrush" Value="{ThemeResource SystemControlForegroundTransparentBrush}" />
    <Setter Property="BorderThickness" Value="{ThemeResource ButtonBorderThemeThickness}" />
    <Setter Property="Padding" Value="2,2,2,2" />
    <Setter Property="HorizontalAlignment" Value="Left" />
    <Setter Property="VerticalAlignment" Value="Center" />
    <Setter Property="FontFamily" Value="Arial" />
    <Setter Property="FontWeight" Value="Bold" />
    <Setter Property="FontSize" Value="18" />
    <Setter Property="UseSystemFocusVisuals" Value="True" />
</Style>