Untitled

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>Moja strona 1</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    <div id="box">
        <div id="naglowek">
            <a href="index.html"><img src="Bez%20nazwy-1.jpg" alt="logo"></a>
        </div>
        <div id="menu">
            <ul>
                <li><a href="zmiana_kolor%C3%B3w.html">Zmiana kolorów</a></li>

                <li><a href="baza_danych.php">Baza danych</a></li>
            </ul>
        </div>
        <div id="zawartosc">
            <form name="formularz" action="#" method="post">
                Marka:
                <input type="text" name="marka" id="marka"><br><br>
                <input type="submit" name="Wyślij">
            </form>
            <?php
                $host="localhost";
                $db_user="root";
                $db_password="";
                $db_name="komis";
            $connect= @new mysqli($host, $db_user, $db_password, $db_name);
            if($connect->connect_errno !=0)
            {
                echo "Error:".$connect->connect_errno;
            }
            else
            {
                $marka=$_POST['marka'];

               $sql = "SELECT * FROM samochody WHERE marka= $marka";

                if($rezultat= $connect->query($sql))
                {
/*                    $wiersze= $rezultat->fetch_assoc();
                    $cena= $rezultat['cena'];
                    $marka=$rezultat['marka'];

                    echo "Marka:".$marka."<br>";
                    echo "Cena:".$cena;*/
                    echo "Dziala";
                }
            }

            ?>
        <div id="stopka">
        </div>
    </div>
        <script>
            function czerwony (){
                var x= document.getElementById("kwadrat");
                x.style.backgroundColor="red";
            }
    </script>
</body>

</html>