<style>
table#students {
    font-size:16px;
    font-family: "Trebuchet MS", Arial, Helvetica, sans-serif;
    border-collapse: collapse;
    border-spacing: 0;
    width: 100%;
}

#students td, #students th {
    border: 1px solid #ddd;
    text-align: left;
    padding: 8px;
}

#students th {
    padding-top: 11px;
    padding-bottom: 11px;
    background-color: #16a085;
    color: white;
}
</style>
<?php
$username = "244623";
$password = "oocohcoh";
$conn = @mysqli_connect("localhost", $username, $password)
    Or die("<p>Unable to connect to the database server.</p>" . "<p>Error code " . mysqli_connect_errno() . ": " . mysqli_connect_error()) . "</p>";

@mysqli_select_db($conn, "244623") Or die("<p>The database is not available. </p>");

if($_GET['delete']){
    $query = "delete from students where email='$_GET[delete]'";
    $rs = mysql_query ($conn, $query);
    //print_r($conn);
    if($rs){
        echo "Successfully deleted student with email $_GET[delete]";
    } else
        echo "Failure deleting student with email $_GET[delete]:" . mysqli_error($conn);
}

$sql         = "SELECT firstname, lastname, email FROM students";
$QueryResult = mysqli_query($conn, $sql);

echo "<h1>Students list</h1>";
echo "<table id='students' width='100%' border='0'>";
echo "<tr>
        <th>Firstname</th>
        <th>Lastname</th>
        <th>Email</th>
        <th>Delete</th>
    </tr>";
$Row = mysqli_fetch_row($QueryResult);
$c   = true;
do {
    echo '<tr bgcolor=' . (($c = !$c) ? '"#7f8c8d"' : '"#f2f2f2"') . ">
            <td>{$Row[0]}</td>
            <td>{$Row[1]}</td>
            <td>{$Row[2]}</td>
            <td ><a href='index.php?delete={$Row[2]}'>Delete</a></td>
        </tr>";
    $Row = mysqli_fetch_row($QueryResult);
} while ($Row);
echo "</table>";
mysqli_close($conn);
?>
<br><br>