wabbajack/Wabbajack/Views/BeginButton.xaml

<UserControl
    x:Class="Wabbajack.BeginButton"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:icon="http://metro.mahapps.com/winfx/xaml/iconpacks"
    xmlns:local="clr-namespace:Wabbajack"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">
    <Grid>
        <Border
            x:Name="BeginButtonPurpleGlow"
            Width="76"
            Height="76"
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Background="{StaticResource PrimaryVariantBrush}"
            CornerRadius="43"
            Visibility="{Binding IsEnabled, ElementName=button, Converter={StaticResource bool2VisibilityHiddenConverter}}">
            <Border.Effect>
                <BlurEffect Radius="10" />
            </Border.Effect>
            <Border.Style>
                <Style TargetType="Border">
                    <Setter Property="Opacity" Value="0.5" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding IsMouseOver, ElementName=BeginButton}" Value="True">
                            <Setter Property="Opacity" Value="0.8" />
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Border.Style>
        </Border>
        <Button
            x:Name="button"
            Width="54"
            Height="54"
            HorizontalAlignment="Center"
            VerticalAlignment="Center"
            Command="{Binding Command, RelativeSource={RelativeSource AncestorType={x:Type UserControl}}}">
            <icon:PackIconMaterial
                Width="25"
                Height="25"
                Margin="5,0,0,0"
                Kind="Play">
                <icon:PackIconMaterial.Style>
                    <Style TargetType="icon:PackIconMaterial">
                        <Setter Property="Foreground" Value="#666666" />
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding IsEnabled, RelativeSource={RelativeSource AncestorType={x:Type Button}}}" Value="True">
                                <Setter Property="Foreground" Value="{StaticResource SecondaryBrush}" />
                            </DataTrigger>
                            <MultiDataTrigger>
                                <MultiDataTrigger.Conditions>
                                    <Condition Binding="{Binding IsMouseOver, RelativeSource={RelativeSource AncestorType={x:Type Button}}}" Value="True" />
                                    <Condition Binding="{Binding IsEnabled, RelativeSource={RelativeSource AncestorType={x:Type Button}}}" Value="True" />
                                </MultiDataTrigger.Conditions>
                                <MultiDataTrigger.Setters>
                                    <Setter Property="Foreground" Value="#00ffe7" />
                                </MultiDataTrigger.Setters>
                            </MultiDataTrigger>
                        </Style.Triggers>
                    </Style>
                </icon:PackIconMaterial.Style>
            </icon:PackIconMaterial>
            <Button.Style>
                <Style BasedOn="{StaticResource CircleButtonStyle}" TargetType="Button">
                    <Setter Property="Background" Value="#333333" />
                    <Style.Triggers>
                        <DataTrigger Binding="{Binding IsEnabled, RelativeSource={RelativeSource Self}}" Value="True">
                            <Setter Property="BorderBrush" Value="{StaticResource SecondaryBrush}" />
                            <Setter Property="Background" Value="#222222" />
                            <Setter Property="Effect">
                                <Setter.Value>
                                    <DropShadowEffect
                                        BlurRadius="15"
                                        ShadowDepth="0"
                                        Color="{StaticResource Secondary}" />
                                </Setter.Value>
                            </Setter>
                        </DataTrigger>
                    </Style.Triggers>
                </Style>
            </Button.Style>
        </Button>
    </Grid>
</UserControl>