body{font-family:Arial,sans-serif;background-color:#f4f4f4;margin:0;padding:0}.container{max-width:600px;margin:50px auto;padding:20px;background:#fff;box-shadow:0 0 10px rgba(0,0,0,.1)}h1{text-align:center}.form-group{margin-bottom:15px}label{display:block;margin-bottom:5px}input[type=text],select,textarea{width:100%;padding:10px;box-sizing:border-box}button{display:block;width:100%;padding:10px;background-color:#007bff;color:#fff;border:none;cursor:pointer}button:hover{background-color:#0056b3}#response{margin-top:20px}#response pre{background:#f4f4f4;padding:10px;border:1px solid #ddd;overflow:auto}