Sure... the simple use of a class will do the job
Code:
.formfield {
border: 1px solid #999;
color: #000;
background-color: #eee;
font-size: 12px;
}
.formbutton {
border: 1px solid #000;
color: #000;
background-color: #c33;
font-size: 12px;
}
HTML Code:
<input type="text" name="name" value="" size="40" class="formfield">
<input type="submit" value="submit" name="submit" class="formbutton">
That should work.
And then you can always have a bit of fun and add some onfocus and mouseover effects 
Use the same code for the CSS and this for the HTML
HTML Code:
<input type="text" name="name" size="40" class="formfield" onfocus="this.style.background='#fff'" onblur="this.style.background='#ded'">
<input type="submit" value="submit" name="submit" class="formbutton" onmouseover="this.style.background='#f66'" onmouseout="this.style.background='#c33'">
Have fun with it
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