Salve io ho una tabella con varie celle come segue:

<tr>
<td width="13%" bgcolor="#FFFFFF" height="177"></td>
<td width="37%" bordercolor="#333333" height="177" bgcolor="#FFFFFF">


</p>


</p>


</p>


</p>


</p>
</td><td width="37%" height="177"></td>
<td width="13%" bgcolor="#FFFFFF" height="177"></td>
</tr>
<tr>
<td width="13%" bgcolor="#FFFFFF"></td>
<td width="37%">


</p>


</p>


</p>


</p>


</p>
</td>
<td width="37%"></td>
<td width="13%" bgcolor="#FFFFFF"></td>
</tr>
<tr>
<td width="13%" bgcolor="#FFFFFF" height="24"></td>
<td width="37%" height="24">


</p>


</p>


</p>


</p>


</p>
</td>
<td width="37%" height="24"></td>
<td width="13%" bgcolor="#FFFFFF" height="24"></td>
</tr>

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Come posso fare a contornare solo il margine esterno delle due celle centrali. (html o css)

GRAZIE! :sexpulp: