Remove mini-text elements from post comments form

Hi

I’m ready to launch today, but my client would like to remove the first 2 lines of the text above “Login as…..” in the post comment element on the page.

When I remove it live using display:none using Firebug, it removes the lines. When I add the codes into my child theme styles.css (see below), it does not do it.

#comments span, .minitext, .form-allowed-tags, #reply-title small, #commentform label {
display: none!important;
}

Can you help me figure this out.

My website is locked to the public so I have includes login credentials to view the site http://surmespieds.com/sur-la-route