Add background

[Partymann2000]

How can add a background color to my code this is my code

        captcha = ImageCaptcha(width=400, height=60, 
                               fonts=["./fonts/Lobster-Regular.ttf"], 
                               font_sizes=(20, 30, 40))
        data = captcha.generate(captcha_text)

[lepture]

The background is generated automatically https://github.com/lepture/captcha/blob/master/src/captcha/image.py#L195