MainWindow.xaml

<Window x:Class="JKLM.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:JKLM"
        mc:Ignorable="d"
        Title="JKLM Solver" Height="230" Width="300" ResizeMode="CanMinimize" FontFamily="Arial">
    <Grid>
        <Label Content="JKLM Solver" HorizontalAlignment="Center" VerticalAlignment="Top" Width="280" FontSize="30" HorizontalContentAlignment="Center" FontFamily="Arial" Margin="0,10,0,0"/>
        <Button x:Name="startSession" Content="Start Session" HorizontalAlignment="Center" VerticalAlignment="Top" Height="120" Width="240" Margin="0,54,0,0" FontFamily="Arial" FontSize="36" Background="White" BorderBrush="Black" BorderThickness="2,2,2,2" Click="startSession_Click"/>

    </Grid>
</Window>