body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .container {
            width: 300px;
            text-align: center;
            background-color: #fff;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
        h1 {
            color: #333;
        }
        input[type="text"],
        input[type="password"],
        input[type="submit"] {
            width: 100%;
            margin-bottom: 15px;
            padding: 10px;
            border: 1px solid #ccc;
            border-radius: 5px;
            box-sizing: border-box;
        }
        input[type="submit"] {
            background-color: #007bff;
            color: #fff;
            cursor: pointer;
            transition: background-color 0.3s;
        }
        input[type="submit"]:hover {
            background-color: #0056b3;
        }
        .error {
            color: red;
            margin-bottom: 15px;
        }