body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .login-container {
            background-color: #fff;
            padding: 30px;
            border-radius: 8px;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
            width: 300px;
            text-align: center;
        }
        .login-container h2 {
            margin-bottom: 20px;
            color: #333;
        }
        .form-group {
            margin-bottom: 15px;
            text-align: left;
        }
        .form-group label {
            display: block;
            margin-bottom: 5px;
            color: #666;
        }
        .form-group input {
            width: 100%;
            padding: 10px;
            box-sizing: border-box;
            border: 1px solid #ddd;
            border-radius: 4px;
        }
        .btn {
            width: 100%;
            padding: 10px;
            background-color: #007bff;
            border: none;
            color: white;
            border-radius: 4px;
            cursor: pointer;
            font-size: 16px;
        }
        .btn:hover {
            background-color: #0056b3;
        }
        .flash-message {
            color: red;
            margin-bottom: 10px;
        }