.calculator { background: white; padding: 20px; border-radius: 8px; box-shadow: 0 10px 20px rgba(0,0,0,0.1); width: 300px; }
        input { width: 100%; padding: 10px; margin: 10px 0; border: 1px solid #ccc; border-radius: 4px; box-sizing: border-box; }
        button { padding: 10px; background-color: #008080; color: white; border: none; border-radius: 4px; cursor: pointer; }
        button:hover { background-color: #004040; }
        .result { margin-top: 20px; font-weight: bold; text-align: center; color: #333; }