1<!DOCTYPE html>
2<html lang="en">
3<head>
4<style>
5th, td {
6 border: 1px solid black;
7}
8</style>
9</head>
10<body>
11
12<table style="width:100%">
13 <tr>
14 <th>Firstname</th>
15 <th>Lastname</th>
16 <th>Age</th>
17 </tr>
18</table>
19
20</body>
21</html>
22