I have a form in html whose "action" attribute calls a contact.php file. The problem is that after I submit the form, the file that is visible is a blank page with the address contact.php and I want to see again the form of the main page.
HTML:
<form id="myForm" action="php-contact/contact.php"
                       method="post" class="contact_form" autocomplete="off"
                       role="form">
                          <div class="form-group">
                            <label for="input-subject">subject</label>
                            <input name="subject" type="text" class="form-control" id="subject" placeholder="your subject" maxlength="20"/>
                          </div>
                          <div class="form-group">    
                              <label for="input-name">name</label>
                              <input name="name"  type="text" class="form-control" id="name" placeholder="your name" maxlength="20"/>
                          </div>
                          <div class="form-group">    
                            <label for="input-email">email address</label>
                            <input name="email"  type="text" class="form-control" id="email" placeholder="your email" maxlength="40"/>
                          </div> 
                          <div class="form-group" >   
                              <label for="input-message">message</label>
                              <textarea name="message" cols="10" rows="10"  class="form-control" id="comment" ></textarea>
                          </div>  
                          <button name="myFormSubmitted" type="submit" class="btn btn-primary btn-lg btn-block">send</button>
                      </form>
PHP:
  <?php
  $name = $_POST['name'];
  $email = $_POST['email'];
  $subject = $_POST['subject'];
  $message = $_POST['message'];
  $to = "pep.g@gmail.com";
  $message = '
  name: '.$name.'
  email: '.$email.'
   message: '.$message.'
  ';
 $headers = 'From: pep.website@website.com';
   if (
    mail($to, $subject, $message, $headers)
) 
      echo"<script>alert('message send succesfully')</script>";
   else
      echo"<script>alert('message not send')</script>";
 ?>
 
     
     
     
     
     
     
    