```ruby
class PauseScreen

  def initialize(window, window_width, window_height)
    @window = window
    @window_width, @window_height = window_width, window_height

    @pause_button = Gosu::Image.new(window, 'media/pause_button.png', false)
    @press_q      = Gosu::Image.new(window, 'media/press_q.png', false)
  end

  def draw
    draw_rect(@window_width, @window_height, Color::Trans_black,
              ZOrder::Pause_background)
    @pause_button.draw(160, 144, ZOrder::Pause_button)
    @press_q.draw(170, 296, ZOrder::Pause_button)
  end

  private

  def draw_rect(width, height, color, z_order)
    # Draws a rectangle by coordinates clockwise from top-left
    @window.draw_quad(0, 0, color, width, 0, color, width, height, color,
                      0, height, color, z_order, :default)
  end

end
```

Use new uppercase constants in PauseScreen
user
```ruby
class PauseScreen

  def initialize(window, window_width, window_height)
    @window = window
    @window_width, @window_height = window_width, window_height

    @pause_button = Gosu::Image.new(window, 'media/pause_button.png', false)
    @press_q      = Gosu::Image.new(window, 'media/press_q.png', false)
  end

  def draw
    draw_rect(@window_width, @window_height, Color::TRANS_BLACK,
              ZOrder::PAUSE_BACKGROUND)
    @pause_button.draw(160, 144, ZOrder::PAUSE_BUTTON)
    @press_q.draw(170, 296, ZOrder::PAUSE_BUTTON)
  end

  private

  def draw_rect(width, height, color, z_order)
    # Draws a rectangle by coordinates clockwise from top-left
    @window.draw_quad(0, 0, color, width, 0, color, width, height, color,
                      0, height, color, z_order, :default)
  end

end
```
assistant