kuhashmi on "Contact Form 7 Customization ?"

I am using contact Us Form7 Plugin. I have successfully customize it according to my need. One thing which i can't able to customize it is submit button.

Here is the contact Us page link.

http://moghulweb.com/KLB/?page_id=52

If you see there is little white shade coming on upper side of the button. I want button color to be flat brown.

How can i remove this white gradient shade.

and i use this CSS code

div.wpcf7 input[type="submit"], input[type="button"], input[type="reset"]
{width:100px; background:#af5103; background:linear-gradient none; border:2px solid #d76a03; color:#fff;
}