CAPTCHA formatting

Hi there, I found many about it, but nothing helps.
The code

<p>[captchac AntiSpam fg:#ffffff bg:#262626 size:m] AntiSpam <em>(bitte Prüfziffer eintragen)</em><br /> [captchar AntiSpam 4/4]</p>

doesn’t work.

I want to make the input field from the Captcha shorter therefore the Captcha and the field are in one line.
With firebug I looked at the shortcode and there is the class:

.wpcf7-form-control-wrap AntiSpam, .wpcf7-form-control wpcf7-captchar

I wrote in the theme-Style:

.wpcf7-form-control-wrap AntiSpam, .wpcf7-form-control wpcf7-captchar {
	max-width: 60px !important;
    /*
}

But this doesn’t work either.

And I am using the Plugin contact-form-7-style. This ist really great. Every change I need happened. But only the captcha-field should be shorter now. Thanks.

https://wordpress.org/plugins/contact-form-7/