#paver-calculator{font-family:Arial,sans-serif;background-color:#f4f4f4;padding:20px;border-radius:8px;box-shadow:0 0 10px rgba(0,0,0,.1);max-width:400px;margin:auto}#paver-calculator .input-group{margin-bottom:15px}#paver-calculator .input-group label{display:block;margin-bottom:5px}#paver-calculator .input-group input,#paver-calculator .input-group select{width:100%;padding:8px;box-sizing:border-box}#paver-calculator button{padding:10px 20px;background-color:#007bff;color:#fff;border:none;border-radius:4px;cursor:pointer}#paver-calculator button:hover{background-color:#0056b3}#paver-calculator #result{margin-top:20px;font-size:1.2em}