def draw():
    screen.fill((255, 255, 255))

    for x in range(70):
        cell_size = 5
        cell_draw_size = cell_size - 1

        screen.draw.filled_rect(
            Rect(
                (x * cell_size, 0),
                (cell_draw_size, cell_draw_size)
            ),
            color=(220, 220, 220)
        )