code: func RandLightColor() color.RGBA {
  
  	red := r.Intn(55) + 200
  	green := r.Intn(55) + 200
  	blue := r.Intn(55) + 200
  
  	return color.RGBA{R: uint8(red), G: uint8(green), B: uint8(blue), A: uint8(255)}
  }
docs: //随机生成浅色.