<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Address Book</title>
    <style>
        body{
            font-family: Arial;
        }
    </style>
</head>
<body>
<center>
    <h1>Online Address/ Contact Book</h1>
    <ul>
        <li><a href="add.php">Add Contact</a></li>
        <li><a href="delete.php">Delete Contact</a></li>
        <li><a href="search.php">Search Contact</a></li>
        <li><a href="list.php">List Contact</a></li>
    </ul>
</center>
</body>
</html>