.calculator{border:1px solid #ccc;border-radius:8px;padding:20px;box-shadow:0 0 10px rgba(0,0,0,0.1);background-color:#f9f9f9;max-width:52ch;margin:auto;text-align:center}.calc-input-group{margin-bottom:15px}.calc-input-group label{margin-right:10px}.calc-input-group input[type="radio"]{margin-right:5px}#area-input input[type="number"]{width:12ch;padding:5px;margin-top:5px;margin-bottom:10px;box-sizing:border-box}#results p{margin:10px 0}