merthealt adlı üyeden alıntı: mesajı görüntüle
evet hocam doğru ama halen bulamadım sorunu
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Bootstrap demo</title>
    <link rel="stylesheet" href="navbar/navbar.css">
    
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://kit.fontawesome.com/9c14f68dfc.js" crossorigin="anonymous"></script>
  </head>
<body>
<header class="border-b md:flex md:items-center md:justify-between p-4 pb-0 shadow-lg md:pb-4">
    <nav class="navbar navbar-expand-lg navbar-light bg-light">
        <div class="container-fluid">
            <a class="navbar-brand" href="#">Test</a>
            <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarText" aria-controls="navbarText" aria-expanded="false" aria-label="Toggle navigation">
                <span class="navbar-toggler-icon"></span>
            </button>
            <div class="collapse navbar-collapse" id="navbarText">
                <ul class="navbar-nav me-auto mb-2 mb-lg-0">
                    <li class="nav-item">
                        <a class="nav-link active" aria-current="page" href="#">Home</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Privacy</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#">Contact</a>
                    </li>
                </ul>
                <form class="d-flex">
                    <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
                    <button class="btn btn-outline-success" type="submit">Search</button>
                </form>
            </div>
        </div>
    </nav>
</header>

</body>
</html>
card.php kodları
<link rel="stylesheet" href="card/card.css">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<script src="https://kit.fontawesome.com/9c14f68dfc.js" crossorigin="anonymous"></script>
<title>Kart Örneği</title>
</head>
<body>
<div class="kart">
    <img src="test.png" alt="img">
    <div class="ikonlar">
        <i class="fab fa-codepen"></i>
        <i class="fas fa-image"></i>
        <
    </div>        
    <div class="aciklama">
        <p>Kart açıklama kısmı</p>
    </div>
    <button class="btn">içerik</button>
</div>
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script>
Kullandığın yapı çok saçma, ikisinde de html5 taglarını açıp kapatmışsın. Navbar.php ve card.php içinde sadece o companentin içeriğini barındır. Yapamazsan iki kodu da gpt ye yaz düzeltir.