.diagnosis-tool{max-width:600px;margin:0 auto;padding:20px;border:1px solid #ccc;border-radius:10px;background-color:#f9f9f9}.diagnosis-title{font-size:1.5em;margin-bottom:20px;text-align:center}.question{margin-bottom:20px}.question-text{font-size:1.2em;margin-bottom:10px}.options label{display:block;margin-bottom:5px}.navigation{text-align:center}.navigation button{padding:10px 20px;margin:5px;font-size:1em;cursor:pointer}#result{margin-top:20px}