MainWindow.xaml

<Window x:Class="ColorPicker.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        WindowStyle="None"
        AllowsTransparency="True"
        Background="Transparent"
        Topmost="True"
        Visibility="Collapsed"
        Title="MainWindow" Height="45" Width="105">
    <Grid>
        <Border CornerRadius="10" Background="#111" Margin="2">
            <StackPanel HorizontalAlignment="Left" VerticalAlignment="Center" Height="35" Width="35" Margin="3,0,0,0">
                <Border CornerRadius="8" x:Name="ColorDisplay" Width="35" Height="35" Background="White" BorderBrush="#333" BorderThickness="1">
                    <Border.Effect>
                        <DropShadowEffect BlurRadius="4" ShadowDepth="2" Direction="340" Color="black" Opacity="0.7" />
                    </Border.Effect>
                </Border>
                <TextBlock x:Name="ColorCodeTextBlock" MouseLeftButtonDown="ColorCodeTextBlock_MouseLeftButtonDown" Foreground="#e4e4e4" FontSize="12" FontFamily="consolas" HorizontalAlignment="Center" Margin="-15, -40, -110, -5" Height="14">
                        FFFFFF
                </TextBlock>
            </StackPanel>
        </Border>
    </Grid>
</Window>