You mean the form "button"? Yes, apply style to it. Actually, you can
apply style to any element.
Here's one method using internal style for the input tag. Add this
between the head tags in the HTML view of a page
<style type="text/css">
input.btn150{
color:#050;
width: 150px;
font-family:'trebuchet ms',helvetica,sans-serif;
font-size:84%;
font-weight:bold;
background-color:#fed;
border:1px solid;
border-top-color:#696;
border-left-color:#696;
border-right-color:#363;
border-bottom-color:#363;
filter

rogid

XImageTransform.Microsoft.Gradient
(GradientType=0,StartColorStr='#ffffffff',EndColorStr='#ffeeddaa');
}
</style>
Then add the "class" attribute to the input tag
<input name="Submit" value="Submit" type="submit" class="btn150">