thankyou.html

<!DOCTYPE html">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
    <link href="https://fonts.googleapis.com/icon?family=Material+Icons" rel="stylesheet">
    <link href="assets/css/style4.css" rel="stylesheet">
    <title>Thank You</title>
</head>
<body>
    <div class="container">
        <div class="jumbotron centered text-center">
            <h1 class="display-3">Thank You!</h1>
            <img src="https://i.pinimg.com/originals/91/36/df/9136df0949a40e6567c6f4f7a6343672.gif" width="400" height="300" alt="Done">
            <!--<i class="material-icons doneicon">done</i> -->
            <p class="lead">You message has been received and we will contact you soon.</p>
            <hr>
            <p class="lead">
              <a class="btn btn-primary btn-lg" href="/" role="button">Continue to homepage</a>
            </p>
          </div>
    </div>
</body>
</html>