body{font-family:Arial,sans-serif;background-color:#f4f4f4;margin:0;padding:20px}.container{max-width:600px;margin:auto;background:#fff;padding:20px;border-radius:5px;box-shadow:0 2px 10px rgba(0,0,0,.1)}h1{text-align:center}.language-selector,.model-selector{margin:10px 0}textarea{width:100%;height:100px;padding:10px;border:1px solid #ccc;border-radius:5px;margin-bottom:10px}button{padding:10px 15px;background-color:#28a745;color:#fff;border:none;border-radius:5px;cursor:pointer}button:hover{background-color:#218838}.message{margin-top:10px;color:red}