JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.5.1.js"></script>
<script src="https://cdn.datatables.net/1.11.3/js/jquery.dataTables.min.js"></script>
<script src="https://cdn.datatables.net/buttons/2.1.0/js/dataTables.buttons.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.1.3/jszip.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.53/pdfmake.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdfmake/0.1.53/vfs_fonts.js"></script>
<script src="https://cdn.datatables.net/buttons/2.1.0/js/buttons.html5.min.js"></script>
<script src="https://cdn.datatables.net/buttons/2.1.0/js/buttons.print.min.js"></script>
<link rel="stylesheet" href="https://cdn.datatables.net/1.11.3/css/jquery.dataTables.min.css">
<link rel="stylesheet" href="https://cdn.datatables.net/buttons/2.1.0/css/buttons.dataTables.min.css">
<table id="example" class="display nowrap" style="width:100%">
        <thead>
            <tr>
                <th>Name</th>
                <th>Position</th>
                <th>Office</th>
                <th>Age</th>
                <th>Start date</th>
                <th>Salary</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <td style='mso-number-format:"0.00%"'>12.23%</td>
                <td>160.23%</td>
                <td>10.263%</td>
                <td>18.243%</td>
                <td>10.29%</td>
                <td>17.23%</td>
            </tr>
        </tbody>
    </table>

JavaScript

$(document).ready(function() {
  $('#example').DataTable({
    dom: 'Bfrtip',
    filename: "abc",
    buttons: [{
      extend: 'excelHtml5',
      text: 'Excel',
      customize: function(xlsx) {
        //Get the styles sheet
        let styles = xlsx.xl['styles.xml'];

        // Create a style which uses numFmtId=10, this is the format for percentage with 2 decimal places
        let style = '<xf numFmtId="10" fontId="0" fillId="0" borderId="0" xfId="0" applyNumberFormat="1"/>';
        
        // Get the current cellXfs
        let cellXfs = $('cellXfs', styles);

				// Append the style to cellXfs, and update the cellXfs count attribute
        cellXfs.append(style);
        cellXfs.attr('count', $('xf', cellXfs).length);
        
        // Get sheet 1 and apply the new style, skipping first two rows
        let sheet = xlsx.xl.worksheets['sheet1.xml'];
        $('row:gt(1) c', sheet).attr('s', $('xf', cellXfs).length - 1);
      }
    }]
  });
});