def draw():
    screen.fill((0, 0, 0))

    grid_x_count = 20
    grid_y_count = 15
    cell_size = 15

    screen.draw.filled_rect(
        Rect(
            0, 0,
            grid_x_count * cell_size, grid_y_count * cell_size
        ),
        color=(70, 70, 70)
    )

    snake_segments = [
        {'x': 2, 'y': 0},
        {'x': 1, 'y': 0},
        {'x': 0, 'y': 0},
    ]

    for segment in snake_segments:
        screen.draw.filled_rect(
            Rect(
                segment['x'] * cell_size, segment['y'] * cell_size,
                cell_size - 1, cell_size - 1
            ),
            color=(165, 255, 81)
        )