HTML Tablo - Tabloya kenar çizgisi vermek

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<!DOCTYPE html>
<html>
<head>
<style>
table, th, td {
    border: 1px solid black;
}
</style>
</head>
<body>

<table style="width:100%">
  <tr>
    <th>Ad</th>
    <th>Soyad</th>    
  </tr>
  <tr>
    <td>Ali</td>
    <td>Veli</td>   
  </tr>
  <tr>
    <td>Cem</td>
    <td>Tem</td>
  </tr>
 
</table>

</body>
</html>