Untitled

<body>
    <form action="login.php" method="post">
        <div class="imgcontainer">
            <img src="img/logo_stevens.png" alt="bedrijfslogo" class="avatar">
        </div>

        <div class="container">
            <label><b>Gebruikersnaam</b></label>
            <input type="text" name="uname" id="uname" required>

            <label><b>Wachtwoord</b></label>
            <input type="password" name="psw" id="psw" required>

            <button type="submit">Login</button>
            <input type="checkbox" checked="checked"> Mij onthouden
        </div>
    </form>
    <?php
    ?>
</body>

<?php

include 'db_connection.php';
$username = $_POST["uname"];
$password = $_POST["psw"];

$sql = mysqli_query($conn, "SELECT FROM gebruiker (username, wachtwoord)
WHERE username = $username AND wachtwoord = $password");

if (mysqli_num_rows($sql) >= 1) {
    header('index.php');
} else {

}
?>