MainWindow.xaml

<Window
        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:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:phantomUi="clr-namespace:PhantomUI"
    xmlns:fa="http://schemas.fontawesome.io/icons/"
    mc:Ignorable="d" x:Class="PhantomUI.MainWindow"
        Title="PhantomUI" Width="541" Height="339" HorizontalAlignment="Center" VerticalAlignment="Center" ResizeMode="NoResize" Icon="media/phantomjs.ico" WindowStartupLocation="CenterScreen" Background="White" WindowStyle="None" BorderThickness="1">
    
    <Grid Margin="10">
        <Button x:Name="_buttonExit" HorizontalAlignment="Left" Margin="485,0,0,0" VerticalAlignment="Top" Width="22" Height="22" Click="ButtonExitClick" Background="{x:Null}" BorderThickness="0">
            <fa:ImageAwesome Icon="Close" Spin="False" Height="15" HorizontalAlignment="Left" Cursor="Hand" />
        </Button>
        <TabControl HorizontalAlignment="Left" Height="299" VerticalAlignment="Top" Width="497" Margin="10,10,0,0">
            <TabItem Header="Main" FontFamily="Elephant" FontSize="14">
                <Grid>
                    <Grid.Background>
                        <LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
                            <GradientStop Color="White" Offset="0"/>
                            <GradientStop Color="White" Offset="1"/>
                            <GradientStop Color="#FFEAEAEA" Offset="0.209"/>
                        </LinearGradientBrush>
                    </Grid.Background>
                    <Button x:Name="_buttonRun" Content="Convert" HorizontalAlignment="Right" Margin="0,75,110,0" VerticalAlignment="Top" Width="75" Click="ButtonRunClick" Background="#FFFBFAFA" />
                    <Button x:Name="_buttonBrowse" HorizontalAlignment="Right" Margin="0,44,110,0" VerticalAlignment="Top" Click="ButtonBrowseClick" Background="{x:Null}" BorderThickness="0" >
                        <StackPanel Orientation="Horizontal">
                            <fa:ImageAwesome x:Name="browseIcon" Icon="FolderOpen" Spin="False" Height="15" HorizontalAlignment="Left" Cursor="Hand" />
                        </StackPanel>
                    </Button>
                    <TextBox x:Name="_textBoxUrl" Margin="25,42,140,204" Style="{StaticResource PlaceHolder}" Tag="paste url or browse to file" TextWrapping="NoWrap" Width="326" Height="23" FontFamily="Arial Narrow"/>
                    
                    <RadioButton x:Name="_radioButtonPdf" Content="PDF" HorizontalAlignment="Left" Margin="25,80,0,0" VerticalAlignment="Top" IsChecked="True"/>
                    <RadioButton x:Name="_radioButtonJpeg" Content="JPEG" HorizontalAlignment="Left" Margin="85,80,0,0" VerticalAlignment="Top"/>
                    <RadioButton x:Name="_radioButtonPng" Content="PNG" HorizontalAlignment="Left" Margin="154,80,0,0" VerticalAlignment="Top"/>
                </Grid>
            </TabItem>
            <TabItem FontFamily="Elephant" FontSize="14">
                <TabItem.Header>
                    <fa:ImageAwesome Icon="Cog" Spin="False" Height="15" HorizontalAlignment="Left" Cursor="Hand" />
                </TabItem.Header>

                <Grid>
                    <Grid.Background>
                        <LinearGradientBrush EndPoint="0.5,1" MappingMode="RelativeToBoundingBox" StartPoint="0.5,0">
                            <GradientStop Color="White" Offset="0"/>
                            <GradientStop Color="White" Offset="1"/>
                            <GradientStop Color="#FFEAEAEA" Offset="0.209"/>
                        </LinearGradientBrush>
                    </Grid.Background>

                    <TextBox x:Name="_viewPortWidth" Height="23" TextAlignment="Right" TextWrapping="NoWrap" Text="1366" Margin="25,51,416,195" FontFamily="Arial Narrow" Width="50"/>
                    <TextBox x:Name="_viewPortHeight" Height="23" TextAlignment="Left" TextWrapping="NoWrap" Text="768" Margin="102,51,339,195" FontFamily="Arial Narrow"/>
                    <Label x:Name="label_ViewPort" Content="Viewport size" HorizontalAlignment="Left" Margin="19,20,0,0" VerticalAlignment="Top" FontFamily="Arial"/>
                    <Label x:Name="label" Content="x" HorizontalAlignment="Left" Margin="80,51,0,0" VerticalAlignment="Top" FontFamily="Arial"/>
                    <Label x:Name="label_Orientation" Content="Orientation" HorizontalAlignment="Left" Margin="19,82,0,0" VerticalAlignment="Top" FontFamily="Arial"/>
                    <CheckBox x:Name="_orientationPortrait" Content="Portrait" HorizontalAlignment="Left" Margin="25,113,0,0" VerticalAlignment="Top" FontFamily="Arial" IsChecked="True"/>
                    <Button x:Name="button_Script" Content="Open Script" HorizontalAlignment="Left" Margin="380,66,0,0" VerticalAlignment="Top" Width="101" Click="ScriptButtonClick" Background="White"/>
                    <Button x:Name="button_Config" Content="Open Config" HorizontalAlignment="Left" Margin="380,27,0,0" VerticalAlignment="Top" Width="101" Click="ConfigButtonClick" Background="White"/>
                    <Button x:Name="_buttonGitHub" HorizontalAlignment="Left" Margin="379,156,0,0" VerticalAlignment="Top" Click="ButtonGitHubClick" BorderThickness="0" Focusable="False" Foreground="{x:Null}" BorderBrush="{x:Null}" Background="{x:Null}" Visibility="Visible">
                        <fa:ImageAwesome Icon="Github" Spin="False" HorizontalAlignment="Left" Cursor="Hand" Margin="0" Width="101" ToolTip="Open project page" />
                    </Button>
                    <Grid HorizontalAlignment="Left" Height="138" Margin="7,11,0,0" VerticalAlignment="Top" Width="166" Background="#7FE8E8E8">
                        <Label x:Name="label1" Content="In progress" HorizontalAlignment="Left" Margin="33,49,0,0" VerticalAlignment="Top" RenderTransformOrigin="0.5,0.5" Foreground="#FF992424">
                            <Label.RenderTransform>
                                <TransformGroup>
                                    <ScaleTransform/>
                                    <SkewTransform/>
                                    <RotateTransform Angle="-30.899"/>
                                    <TranslateTransform/>
                                </TransformGroup>
                            </Label.RenderTransform>
                        </Label>
                    </Grid>
                </Grid>
            </TabItem>
        </TabControl>
    </Grid>
</Window>