.calculator-container{text-align:center;border:1px solid #ccc;padding:20px;border-radius:10px;box-shadow:0 0 10px rgba(0,0,0,.1)}.input-group{margin-bottom:10px}.calculator-container label{display:block;margin-bottom:5px}.calculator-container input{width:100%;padding:8px;box-sizing:border-box}.calculator-container button{color:#fff;border:none;padding:10px 20px;text-align:center;text-decoration:none;display:inline-block;font-size:16px;margin:4px 2px;cursor:pointer;border-radius:5px}#result{margin-top:20px;font-weight:700}