CSS and CAPTCHA help needed please.

Hi,
I am using the contact form for the first time and really appreciate your help here.

With the CSS on the actual widget do I type it like.....

width: 100%;
or
width="100%"

Either doesn't work for me

Also when I disable captcha I still the the big black type "CAPTCHA" on the form which I don't want to have.

See the attached image for both queries. Thank you.