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<style>
table{
 border: 1px solid #000000;
}
.oben { border-top:1px solid #000000 }
.rechts { border-right:1px solid #000000 }
.unten { border-bottom:1px solid #000000 }
.links { border-left:1px solid #000000 }
table {border:none;border-collapse:collapse;}
</style>

<table class="table">
  <tr>
    <td class="oben rechts links">hahahasdasdasd</td>
  </tr>
  <tr>
    <td class="oben rechts links">asdasdasdasdasdasdasdasdasd</td>
  </tr>
  <tr>
    <td class="oben rechts links unten">asdasdasdasdasdasd</td>
  </tr>
</table>

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<style>
table { border: 1px...; }
td {border-bottom: 1px...;}
</style>

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table {
border-spacing: 0;
border-collapse: collapse;
}

td {
border: 1px solid #000;
}