CODIGO Css darle un toque en 3D a tu Boton

<style type="text/css">
.boton{
font-size:10px;
font-family:Verdana,Helvetica;
font-weight:bold;
color:white;
background:#638cb5;
border:0px;
width:80px;
height:19px;
}
</style>
<div align="center">
<form name="form1" action="URL del bonton" target="_blank" method="post">
<input type="text" name="prueba"><br><br>
<input type="submit" value="enviar" class="boton">
</form>
</div>