body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }
        .calculator-container {
            background: white;
            padding: 20px;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            text-align: center;
            width: 350px;
        }
        .calculator-title {
            font-size: 22px;
            margin-bottom: 15px;
        }
        .input-field {
            width: 100%;
            padding: 10px;
            margin: 10px 0;
            font-size: 16px;
            border: 1px solid #ccc;
            border-radius: 5px;
        }
        .calculate-button {
            width: 100%;
            padding: 10px;
            background-color: #007bff;
            color: white;
            font-size: 16px;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            transition: background 0.3s;
        }
        .calculate-button:hover {
            background-color: #0056b3;
        }
        .result-container {
            margin-top: 20px;
            font-size: 18px;
            font-weight: bold;
            color: #333;
        }