/// <summary>
        /// Draw content.
        /// </summary>
        /// <param name="spriteBatch"></param>
        public void Draw(GameTime gameTime, SpriteBatch spriteBatch)
        {
            messageTimer += (float)gameTime.ElapsedGameTime.TotalSeconds;

            Scrolling1.Draw(spriteBatch);
            Scrolling2.Draw(spriteBatch);

            foreach (var sprite in Sprites)
            {
                sprite.Draw(gameTime, spriteBatch);
            }

            if (IsUpgraded && messageTimer < 3f)
            {
                string message           = "Ship Upgraded!";
                float  messagePossitionX = Camera.SCREEN_WIDTH / 2 - FontManager.Instance.Arial.MeasureString(message).X / 2;

                spriteBatch.DrawString(FontManager.Instance.Arial, message, new Vector2(messagePossitionX, messagePositionY), Color.White);

                messagePositionY--;
            }
            else
            {
                IsUpgraded       = false;
                messagePositionY = Camera.SCREEN_HEIGHT / 2;
            }
        }
        /// <summary>
        /// Update background images.
        /// </summary>
        private void UpdateBackground()
        {
            // X is increasing img1
            if (Scrolling1.Rectangle.X + Scrolling1.Texture.Width <= Player.Position.X - 330)
            {
                Scrolling1.Rectangle.X = Scrolling2.Rectangle.X + Scrolling2.Texture.Width;
            }
            // Y is decreasing img1
            if (Scrolling1.Rectangle.Y + Scrolling1.Texture.Height <= Player.Position.Y - 200)
            {
                Scrolling1.Rectangle.Y = Scrolling2.Rectangle.Y + Scrolling2.Texture.Height;
            }

            // X is increasing img2
            if (Scrolling2.Rectangle.X + Scrolling2.Texture.Width <= Player.Position.X - 330)
            {
                Scrolling2.Rectangle.X = Scrolling1.Rectangle.X + Scrolling1.Texture.Width;
            }
            // Y is decreasing img2
            if (Scrolling2.Rectangle.Y + Scrolling2.Texture.Height <= Player.Position.Y - 200)
            {
                Scrolling2.Rectangle.Y = Scrolling1.Rectangle.Y + Scrolling1.Texture.Height;
            }
            // Y is decreasing
            if (Scrolling1.Rectangle.Y >= Player.Position.Y)
            {
                Scrolling1.Rectangle.Y -= 200;
                Scrolling2.Rectangle.Y -= 200;
            }
            // X is decreasing
            if (Scrolling1.Rectangle.X >= Player.Position.X - 200)
            {
                Scrolling1.Rectangle.X -= 200;
                Scrolling2.Rectangle.X -= 200;
            }

            Scrolling1.Update();
            Scrolling2.Update();
        }