body {
            background: #2c3e50;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .login-box {
            width: 100%;
            max-width: 400px;
        }

        .card {
            border: none;
            border-radius: 10px;
        }

        .card-header {
            background: #1f2a36;
            color: white;
            text-align: center;
            font-size: 20px;
            padding: 15px;
        }

        .btn-primary {
            width: 100%;
        }