Contact Form Message Send Animation - php

Question

got a quick question about my contact form. When u send a message then the page reload and u coming to the header of the page. I would like to have it that you stay on the contact section when u send the message and that under the send button a text shows up like "hey, the message is send" I got in the code my homepage as link but I have a one-age site so I dont know how to fix the section that it stands on the contact section...
here is the code from the phpmailer:
<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
require 'src/Exception.php';
require 'src/PHPMailer.php';
require 'src/SMTP.php';
$mail = new PHPMailer(true); // Passing `true` enables exceptions
try {
//Server settings
$mail->SMTPDebug = 0; // Enable verbose debug output
$mail->isSMTP(); // Set mailer to use SMTP
$mail->Host = 'smtp.test.de'; // Specify main and backup SMTP servers
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Username = 'MY EMAIL'; // SMTP username
$mail->Password = 'MY PASSWORT!'; // SMTP password
$mail->SMTPSecure = 'ssl'; // Enable TLS encryption, `ssl` also accepted
$mail->Port = 465; // TCP port to connect to
//Recipients
$mail->setFrom('MY EMAIL');
$mail->addAddress($_POST['mail']); // Add a recipient
//Content
$mail->isHTML(true); // Set email format to HTML
$mail->Subject = $_POST['subject'];
$mail->Body = $_POST['text'];
$mail->send();
//echo 'Message has been sent';
header('Location: http://www.example.com/contact.php');
exit();
} catch (Exception $e) {
echo 'Message could not be sent.';
echo 'Mailer Error: ' . $mail->ErrorInfo;
}
?>
if you need the homepage to see what I mean: www.yveslumiere.com
Cheers Yves :-)