jellyfin/MediaBrowser.Installer/MainWindow.xaml

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:Code="clr-namespace:MediaBrowser.Installer.Code" x:Class="MediaBrowser.Installer.MainWindow"
        Title="Install Media Browser Server" Height="383.481" Width="663.057" ResizeMode="NoResize" WindowStyle="None">
    <Border BorderBrush="DarkGray" BorderThickness="2" Margin="0,0,0,0">
        <Grid Margin="-2,0,0,0">
            <Image x:Name="imgLogo" HorizontalAlignment="Center" Height="172" Margin="10,10,57,0" VerticalAlignment="Top" Width="590" Source="Code/Images/mb3logo800.png" Opacity="0.5"/>
            <Grid HorizontalAlignment="Left" Height="153" Margin="0,173,0,0" VerticalAlignment="Top" Width="662" Background="Gray">
                <TextBlock x:Name="lblStatus" HorizontalAlignment="Left" Margin="12,14,0,18" Width="637" FontSize="36" Foreground="#FFE6D7D7" Text="Status" TextWrapping="WrapWithOverflow"/>
                <Rectangle Fill="#FF49494B" HorizontalAlignment="Left" Height="13" Stroke="Black" VerticalAlignment="Bottom" Width="662"/>
                <Rectangle x:Name="rectProgress" Fill="#FF0A0ABF" HorizontalAlignment="Left" Height="13" Stroke="Black" VerticalAlignment="Bottom" Width="0"/>
            </Grid>
                <Button x:Name="btnCancel" Content="Cancel" HorizontalAlignment="Left" Margin="552,336,0,0" Width="97" FontSize="14" Click="btnCancel_Click" Height="31" VerticalAlignment="Top"/>
        </Grid>
        
    </Border>
    <Window.Resources>
        <!--Metro Button-->
        <Style TargetType="{x:Type Button}" BasedOn="{x:Null}">
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="Foreground" Value="#222222"/>
            <Setter Property="FontSize" Value="16"/>
            <Setter Property="Padding" Value="10,5,10,5"/>
            <Setter Property="BorderBrush" Value="#222222"/>
            <Setter Property="BorderThickness" Value="2"/>
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">
                        <!-- We use Grid as a root because it is easy to add more elements to customize the button -->
                        <Grid x:Name="Grid">
                            <Border x:Name="Border" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}"/>

                            <!-- Content Presenter is where the text content etc is placed by the control -->
                            <!-- The bindings are useful so that the control can be parameterized without editing the template -->
                            <ContentPresenter HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="{TemplateBinding Padding}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" RecognizesAccessKey="True"/>
                        </Grid>

                        <!--Each state sets a brush on the Border in the template -->
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsPressed" Value="true">
                                <Setter Property="Background" Value="#222222" TargetName="Border"/>
                                <Setter Property="BorderBrush" Value="#222222" TargetName="Border"/>
                                <Setter Property="Foreground" Value="White"/>
                                <Setter Property="FontSize" Value="16"/>
                            </Trigger>
                            <Trigger Property="IsEnabled" Value="true"/>
                            <Trigger Property="IsEnabled" Value="false">
                                <Setter Property="BorderBrush" Value="#7f222222" TargetName="Border"/>
                                <Setter Property="Foreground" Value="#7f222222"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Window.Resources>
</Window>