codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="it" lang="it">
<head>
	<title>test</title>
	<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
</head>
<body>

<table style="width: 300px;">
<tbody>

<tr>
<td style="height: 50px; width: 150px; line-height: 48px; background-color: red;">io sono esteso</td>
<td style="height: 50px; width: 150px; line-height: 48px; background-color: green;">io sono normale</td>
<tr>

<tbody>
</table>

</body>

</html>
modificalo secondo le tue esigenze