display:none; not working

Hi,

I’m trying to create a honeytrap captcha and I can’t get the field to disappear using –

#comment-field {
style: display: none;
}

I’ve tried –

#comment-field {
display: none;
}

And I’ve tried –

.entry-content #comment-field {
style: display: none;
}

This is the contact form –
http://www.isabels-typing-services.co.uk/contact-us.html

Thanks for any help 🙂