Таблицы с бордером в 1 пиксель: 
 Вариант 1:  <table width="300" border="1" bgcolor="#000000" cellpadding="0" cellspacing="1" summary="content"> <tr><td bgcolor="#FFFFFF">&nbsp;</td><td bgcolor="#FFFFFF">&nbsp;</td><td bgcolor="#FFFFFF">&nbsp;</td></tr> <tr><td bgcolor="#FFFFFF">&nbsp;</td><td bgcolor="#FFFFFF">&nbsp;</td><td bgcolor="#FFFFFF">&nbsp;</td></tr> <tr><td bgcolor="#FFFFFF">&nbsp;</td><td bgcolor="#FFFFFF">&nbsp;</td><td bgcolor="#FFFFFF">&nbsp;</td></tr> <tr><td bgcolor="#FFFFFF">&nbsp;</td><td bgcolor="#FFFFFF">&nbsp;</td><td bgcolor="#FFFFFF">&nbsp;</td></tr> </table>
 Вариант 2:  <table width="300" border="0" cellspacing="0" cellpadding="0" summary="content"> <tr align="center"> <td class="r">1</td> <td class="r b t">2</td> <td class="r b t">3</td> <td class="r b t">4</td> <td class="r b t">5</td> <td class="r b t">6</td> <td class="n">7</td> </tr> <tr align="center"> <td class="r">1</td> <td class="r b">2</td> <td class="r b">3</td> <td class="r b">4</td> <td class="r b">5</td> <td class="r b">6</td> <td class="n">7</td> </tr> </table> Описание класса css: .input { .r {border-right: #800000 1px solid;} .b {border-bottom: #800000 1px solid;} .l {border-left: #800000 1px solid;} .t {border-top: #800000 1px solid;} .n { border-right: none 0px; border-left: none 0px; border-bottom: none 0px; border-top: none 0px;}