body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,sans-serif;background-color:#f0f2f5;margin:0;padding:0}h1{text-align:center;color:#333}input[type=text]{border:1px solid #ccc;border-radius:6px;font-size:16px}input[type=range]{width:100%}label{display:block;font-size:14px;margin-bottom:4px}button{padding:10px 16px;border:none;background-color:#007bff;color:#fff;border-radius:6px;cursor:pointer;transition:background-color .3s}button:hover{background-color:#0056b3}a button{background-color:#28a745}a button:hover{background-color:#1c7c31}