public void Zufall()
        {
            int maxLeft = Convert.ToInt32(Grid1.ActualWidth - button1.Width);
            int maxTop = Convert.ToInt32(Grid1.ActualHeight - button1.Height);

            Random rand1 = new Random(Guid.NewGuid().GetHashCode());
            Random rand2 = new Random(Guid.NewGuid().GetHashCode());
            Random rand3 = new Random(Guid.NewGuid().GetHashCode());
            Random rand4 = new Random(Guid.NewGuid().GetHashCode());
            Random rand5 = new Random(Guid.NewGuid().GetHashCode());
            Random rand6 = new Random(Guid.NewGuid().GetHashCode());

            Brush brush1 = new SolidColorBrush(Color.FromRgb((byte)rand1.Next(1, 255), (byte)rand1.Next(1, 255), (byte)rand1.Next(1, 233)));
            Brush brush2 = new SolidColorBrush(Color.FromRgb((byte)rand2.Next(1, 255), (byte)rand2.Next(1, 255), (byte)rand2.Next(1, 233)));
            Brush brush3 = new SolidColorBrush(Color.FromRgb((byte)rand2.Next(1, 255), (byte)rand2.Next(1, 255), (byte)rand2.Next(1, 233)));
            Brush brush4 = new SolidColorBrush(Color.FromRgb((byte)rand2.Next(1, 255), (byte)rand2.Next(1, 255), (byte)rand2.Next(1, 233)));
            Brush brush5 = new SolidColorBrush(Color.FromRgb((byte)rand2.Next(1, 255), (byte)rand2.Next(1, 255), (byte)rand2.Next(1, 233)));
            Brush brush6 = new SolidColorBrush(Color.FromRgb((byte)rand2.Next(1, 255), (byte)rand2.Next(1, 255), (byte)rand2.Next(1, 233)));


            button1.Margin = new Thickness(rand1.Next(maxLeft), rand1.Next(maxTop), 0, 0);
            button1.Height = rand1.Next(maxTop);
            button1.Width = rand1.Next(maxLeft);
            button1.Background = brush1;

            Background.Fill = brush2;

            Rectangle1.Margin = new Thickness(rand3.Next(maxLeft), rand3.Next(maxTop), 0, 0);
            Rectangle1.Height = rand3.Next(maxTop);
            Rectangle1.Width = rand3.Next(maxLeft);
            Rectangle1.Fill = brush3;

            Rectangle2.Margin = new Thickness(rand4.Next(maxLeft), rand4.Next(maxTop), 0, 0);
            Rectangle2.Height = rand4.Next(maxTop);
            Rectangle2.Width = rand4.Next(maxLeft);
            Rectangle2.Fill = brush4;

            Rectangle3.Margin = new Thickness(rand5.Next(maxLeft), rand5.Next(maxTop), 0, 0);
            Rectangle3.Height = rand5.Next(maxTop);
            Rectangle3.Width = rand5.Next(maxLeft);
            Rectangle3.Fill = brush5;

            Rectangle4.Margin = new Thickness(rand6.Next(maxLeft), rand6.Next(maxTop), 0, 0);
            Rectangle4.Height = rand6.Next(maxTop);
            Rectangle4.Width = rand6.Next(maxLeft);
            Rectangle4.Fill = brush6;