omblogger on "[Plugin Contact Form 7] Style of on field different!"

Hello,

i have a problem when i add the contact form to my website, then all the fields are styled ok, but the field with E-Mail looks different. So the border is different, the width, the height, and so on.

How can i solve this? with CSS, and how?

http://wordpress.org/extend/plugins/contact-form-7/