​x
 
<html>
<head>
<style type="text/css">
table,td,th
  {
  border:1px solid black;
  }
​
table
  {
  width:100%;
  }
​
th
  {
  height:50px;
  }
</style>
</head>
​
<body>
<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>
</body>
</html>
​