<style type="text/css">
table
  {
  border-collapse:collapse;
  }

table, td, th
  {
  border:1px solid black;
  }
</style>

<table>
<tr>
<th>Firstname</th>
<th>Lastname</th>
</tr>
<tr>
<td>Bill</td>
<td>Gates</td>
</tr>
<tr>
<td>Steven</td>
<td>Jobs</td>
</tr>
</table>