message: mentioned that the canvas is actually transparent black to make it easier to understand what's going on
diff: @@ -161,7 +161,7 @@ impl EventHandler for MainState {
  .dest(Vec2::new(8., 4.))
  .color(Color::WHITE),
  )?;
  - let text = graphics::Text::new(("drawn onto a (transparent) canvas:", self.font, 20.0));
  + let text = graphics::Text::new(("drawn onto a (transparent black) canvas:", self.font, 20.0));
  graphics::draw(
  ctx,
  &text,
  