Código:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="es" xml:lang="es">
<head>
<title>Titulo</title>
<style>
.mitabla {
font: normal bolder 12px Verdana, Geneva, Arial, Helvetica, sans-serif;
color: #0033FF;
background: #99FF66;
}
.mitabla, .mitabla td , .mitabla th { border: 1px solid #000033; }
.mitabla th { background: Black; color: white; }
</style>
</head>
<body>
<table class="mitabla">
<tr><th>Col1</th><th>Col2</th></tr>
<tr><td>Cel1</td><td>Cel2</td></tr>
<tr><td>Cel3</td><td>Cel4</td></tr>
</table>
</body>
</html>
Saludos