body {
            background-color: #252525;
            color: #ffffff;
            font-family: Arial, sans-serif;
        }
        .card {
            background-color: #333333;
            border: none;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
        }
        .card-header {
            background-color: #222222;
            border-bottom: none;
            text-align: center;
        }
        .card-header h2 {
            margin: 20px 0;
            font-size: 28px;
        }
        .form-label, .btn-primary {
            color: #ffffff;
        }
        .form-control {
            background-color: #444444;
            color: #ffffff;
            border: none;
        }
        .btn-primary {
            background-color: #007bff;
            border: none;
        }
        .btn-primary:hover {
            background-color: #0056b3;
        }
        .alert-danger {
            display: none;
        }