.rente-container {
            max-width: 400px;
            margin: auto;
            padding: 20px;
            border: 1px solid #ddd;
            border-radius: 5px;
            box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.1);
        }
        .rente-input {
            width: 100%;
            padding: 8px;
            margin: 5px 0;
            border: 1px solid #ddd;
            border-radius: 3px;
        }
        .rente-button {
            background-color: #007bff;
            color: white;
            border: none;
            padding: 10px;
            width: 100%;
            cursor: pointer;
            margin-top: 10px;
        }
        .rente-button:hover {
            background-color: #0056b3;
        }
        .rente-result {
            margin-top: 20px;
            font-size: 1.2em;
        }