body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .container {
            background: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            width: 300px;
            text-align: center;
        }
        h2 {
            margin-bottom: 20px;
            color: #333;
        }
        label {
            font-weight: bold;
            display: block;
            margin-top: 10px;
        }
        input[type="text"] {
            width: 100%;
            padding: 8px;
            margin-top: 5px;
            border: 1px solid #ccc;
            border-radius: 4px;
            font-size: 16px;
        }
        input[type="submit"], button {
            margin-top: 20px;
            background: #000000;
            color: white;
            border: none;
            padding: 10px;
            font-size: 16px;
            cursor: pointer;
            border-radius: 4px;
            width: 100%;
        }
        input[type="submit"]:hover, button:hover {
            background: #0056b3;
        }
        #result {
            margin-top: 15px;
            font-size: 18px;
            font-weight: bold;
            color: #333;
        }