表の細い枠線

<style type="text/css"> 
.mytable 
{ 
  border-collapse: collapse; 
  border: none; 
} 
.myTd 
{ 
  border: solid #99bbE8 1px;
} 
</style> 
<table width="100%" class="mytable">
<tr>
<td class="myTd"></td>
</tr>
</table>