def get_offset
      platform = ChromedriverScreenshot::Platforms.platform
      offset_x = @x - platform.window_x
      offset_y = @y - platform.window_y
      [offset_x, offset_y]
    end
def get_offset
      platform = ChromedriverScreenshot::Platforms.platform
      offset_x = @x - platform.window_x
      offset_y = @y - platform.window_y
      [offset_x, offset_y]
    end
can't scroll past ends of page, so sometimes position won't be accurate