body{font-family:"Arial",sans-serif;margin:0;padding:0;display:flex;justify-content:center;align-items:center;background-color:#f4f4f4;}.calculator-container{background-color:#fff;padding:20px;border-radius:8px;box-shadow:0 0 10px rgba(0,0,0,.1);}.radio-group{display:flex;margin-bottom:10px;}.radio-group input{margin-right:5px;}.radio-group label{padding-right:10px;}button{background-color:#007bff;color:#fff;border:none;padding:10px 20px;cursor:pointer;border-radius:4px;}button:hover{background-color:#0056b3;}