Here's a tip sent in by Eric Stokes from South Africa:
You can colour form objects in browsers which helps if you are displaying buttons or text fields according to different types of data.
<style type="text/css">
<!--
body {font-family: helvetica}
p {font-size: 15pt}
.red {color: red}
.blue {color: blue}
-->
</style>
<input type="submit" name="" class="blue" value="" >
<input type="text" name="" class="red" size="2" value="0" maxlength="1">