body {
            height: 200vh; /* Per permettere lo scroll */
            font-family: sans-serif;
            padding: 20px;
        }
        .back-button {
            position: fixed; /* Fisso rispetto alla viewport */
            bottom: 520px;
            right: 20px;
            background-color: #c0c0c0;
            color: black;
            padding: 10px 15px;
            border-radius: 5px;
            text-decoration: none;
            cursor: pointer;
            display: none; /* Nascosto inizialmente */
            z-index: 1000; /* Sopra altri elementi */
            box-shadow: 0 2px 5px rgba(0,0,0,0.2);
            transition: opacity 0.3s ease;
        }
        .back-button:hover {
            background-color: #121212;
        }