.calculator{background-color:#fff;padding:20px;border-radius:8px;box-shadow:0 0 10px rgba(0,0,0,.1);text-align:center}.calculator h2{color:#007BFF}.calculator label{display:block;margin-top:10px}.calculator select,input{width:100%;padding:8px;margin-top:5px;margin-bottom:15px;box-sizing:border-box}.calculator button{background-color:#007BFF;color:#fff;padding:10px 20px;border:none;border-radius:4px;cursor:pointer}.calculator button:hover{background-color:#0056b3}.calculator h3{margin-top:20px}.calculator p{font-size:18px;font-weight:700;color:#28a745}