MainWindow.xaml

<Window x:Class="MyPomodoroApp.MainWindow"
        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:local="clr-namespace:MyPomodoroApp"
        mc:Ignorable="d"
        Title="MyPomodoroApp" Height="450" Width="450" Loaded="Window_Loaded" WindowStyle="None" ResizeMode="NoResize">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="31*"/>
            <ColumnDefinition Width="419*"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="50
                           "/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <!--Header-->
        <Grid x:Name="GridHeader" Background="#FF588157" MouseLeftButtonDown="Grid_MouseLeftButtonDown" Grid.ColumnSpan="2">
            <Grid HorizontalAlignment="Right">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="{Binding ElementName=GridHeader, Path=ActualHeight}"></ColumnDefinition>
                    <ColumnDefinition Width="{Binding ElementName=GridHeader, Path=ActualHeight}"></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <Button x:Name="MinimizeButton" Content="-" Click="MinimizeButton_Click" Background="#00DDDDDD" BorderBrush="#00707070" Foreground="#FFDAD7CD" Margin="0,0,0,5" FontSize="24"/>
                <Button x:Name="CloseButton" Content="x" Grid.Column="1" Click="CloseButton_Click" Background="#00DDDDDD" BorderBrush="#00707070" Foreground="#FFDAD7CD" Margin="0,0,0,5" FontSize="24"></Button>
            </Grid>
            <Grid HorizontalAlignment="Left">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="{Binding ElementName=GridHeader, Path=ActualHeight}"></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <Button x:Name="SettingsButton" Content="~" FontFamily="Bahnschrift" Background="#00DDDDDD" BorderBrush="#00707070" Foreground="#FFDAD7CD" FontSize="24" Click="SettingsButton_Click"/>
            </Grid>
            <Label x:Name="AppNameLabel" Content="MyPomodoroApp" HorizontalAlignment="Center" VerticalAlignment="Center" FontFamily="Bahnschrift" FontSize="18" Foreground="#FFDAD7CD"/>
        </Grid>
        <!--Content-->
        <Grid Grid.Row="1" Background="#FF588157" Grid.ColumnSpan="2">
            <Frame x:Name="MainFrame" NavigationUIVisibility="Hidden" JournalOwnership="OwnsJournal"/>
        </Grid>
    </Grid>
</Window>