h2{text-align:center}input,textarea{width:-webkit-fill-available;padding:10px;margin:10px 0;border:1px solid #ccc;border-radius:5px}button{width:100%;padding:10px;background:#28a745;color:#fff;border:none;border-radius:5px;cursor:pointer;font-size:16px}button:disabled{background:#ccc;color:inherit}.sub-headline{text-align:center}