PHP login code

$nick = $_POST['userName'];
            $pass = $_POST['passWord'];
            // Of course replace all the foo stuff with actual info, it does connect to the database correctly
            $dsn = "mysql:dbname=foo;host=foo";
            try {
                $dbh = new PDO($dsn, "foo", "foo");
            } catch (PDOException $e) {
                echo "Connection failed: ".$e->getMessage();
            }

            if (isset($_POST['submitButton'])) {
                if ($nick == "" && $pass == "") {
                    echo "<p style=\"text-align:center;display-style:block;margin-left:auto;margin-right:auto;margin-top:0px;font-size:18pt;\">Username and password not entered</p>";
                } else if ($nick == "") {
                    echo "<p style=\"text-align:center;display-style:block;margin-left:auto;margin-right:auto;margin-top:0px;font-size:18pt;\">Username not entered</p>";
                } else if ($pass == "") {
                    echo "<p style=\"text-align:center;display-style:block;margin-left:auto;margin-right:auto;margin-top:0px;font-size:18pt;\">Password not entered</p>";
                } else {
                    $loginQuery = $dbh->query("SELECT `PASS` FROM `USER` WHERE `NICK` = '".$nick."'");
                    $loginQueryArr = $loginQuery->fetchAll();
                    $loginQueryArrActual = var_dump($loginQueryArr);
                    if (password_verify($pass, $loginQueryArr['PASS'])) {

                    } else {
                        echo "<p style=\"text-align:center;display-style:block;margin-left:auto;margin-right:auto;margin-top:0px;font-size:18pt;\">Username/password does not match that on file</p>";
                    }
                }
            }