MainPage.xaml.cs

private void LayoutGameBoard()
{
    var minDimension = Math.Min(GameCanvasContainer.ActualHeight, GameCanvasContainer.ActualWidth);
    var cellSize = (int)minDimension / _gameState.Size;
    // make cell size a multiple of 4 for proper scaling
    cellSize = (cellSize / 4) * 4;

    if (cellSize <= 0)
    {
        cellSize = 4;
    }

    GameCanvas.Height = GameCanvas.Width = cellSize * _gameState.Size;

    for (var row = 0; row < _gameState.Size; row++)
    {
        for (var column = 0; column < _gameState.Size; column++)
        {
            var cell = GetCell(row, column);
            cell.SetValue(Canvas.LeftProperty, (double)(column * cellSize));
            cell.SetValue(Canvas.TopProperty, (double)(row * cellSize));
            cell.Height = cellSize - 1;
            cell.Width = cellSize - 1;
        }
    }
}