displaying an error msg in same page not in white one using PHP form

I have a form in index.php

    

        Email address
        
    
    

        Password
        
    
    

as you can see if I submit, it would go to loginProcess.php

include_once "config.php";
    $email = $_POST['email'];
    $password = $_POST['password'];
    $sql = "SELECT * FROM users WHERE email='$email' &&
   password='$password'";
   $query = mysqli_query($connect,$sql);
   if($query){
 $row = mysqli_fetch_array($query);
 $rows = mysqli_num_rows($query);
if($rows == 1){
      $user_id = $row['id'];
      $_SESSION['id'] = $user_id;
      $_SESSION['email'] = $email;
      if($row['user_type'] == 1){
        $_SESSION['user_type'] = 1;
        header("Location: admin/index.php");
    }else{
        $_SESSION['user_type'] = 0;
        header("Location: user/index.php");
    }
}
elseif($_SERVER['REQUEST_METHOD'] == 'POST'){
    echo'
You provided wrong information. Please try again
';
}

}

I inserted the bootstrap alert msg inside $_SERVER['REQUEST_METHOD'] to check if it is submitted. However, the msg still appears in white page.