#searchsubmit styling

So I’m attempting to style my searchform.php for my blog, and all is going great. My only problem is, whenever I try to style ‘#searchsubmit’, none of the classes I provide for it seem to work. The button seems to take it’s style traits from ‘#searchform input’ and disregard anything I add to it’s CSS.

Here’s the CSS I’m providing for the button:

#searchsubmit {
 width: 109px;
 height: 29px;
 background-image:url(images/srch_button.png);
 font-size: 12px;
 color: #fff;
}

Any help? Thanks.