JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//cdn.datatables.net/1.10.4/js/jquery.dataTables.min.js"></script>
<script src="//cdn.datatables.net/fixedcolumns/3.0.2/js/dataTables.fixedColumns.min.js"></script>
<script src="//cdn.datatables.net/fixedheader/2.1.2/js/dataTables.fixedHeader.min.js"></script>
<link rel="stylesheet" href="//cdn.datatables.net/1.10.4/css/jquery.dataTables.css">
<link rel="stylesheet" href="//cdn.datatables.net/fixedcolumns/3.0.2/css/dataTables.fixedColumns.css">
<link rel="stylesheet" href="//cdn.datatables.net/fixedheader/2.1.2/css/dataTables.fixedHeader.css">
<div id="content"><table id="table_test" class="row-border" width="100%" cellspacing="0"><thead><tr><th></th><th colspan="31">Janvier 2015</th><th colspan="28">Février 2015</th><th colspan="31">Mars 2015</th></tr><tr><th></th><th class="jour_header">Jeu<br>1</th><th class="jour_header">Ven<br>2</th><th class="jour_header">Sam<br>3</th><th class="jour_header">Dim<br>4</th><th class="jour_header">Lun<br>5</th><th class="jour_header">Mar<br>6</th><th class="jour_header">Mer<br>7</th><th class="jour_header">Jeu<br>8</th><th class="jour_header">Ven<br>9</th><th class="jour_header">Sam<br>10</th><th class="jour_header">Dim<br>11</th><th class="jour_header">Lun<br>12</th><th class="jour_header">Mar<br>13</th><th class="jour_header">Mer<br>14</th><th class="jour_header">Jeu<br>15</th><th class="jour_header">Ven<br>16</th><th class="jour_header">Sam<br>17</th><th class="jour_header">Dim<br>18</th><th class="jour_header">Lun<br>19</th><th class="jour_header">Mar<br>20</th><th class="jour_header">Mer<br>21</th><th class="jour_header">Jeu<br>22</th><th class="jour_header">Ven<br>23</th><th class="jour_header">Sam<br>24</th><th class="jour_header">Dim<br>25</th><th class="jour_header">Lun<br>26</th><th class="jour_header">Mar<br>27</th><th class="jour_header">Mer<br>28</th><th class="jour_header">Jeu<br>29</th><th class="jour_header">Ven<br>30</th><th class="jour_header">Sam<br>31</th><th...

CSS

#content {
    width: 100%;
    height: 100%;
}

JavaScript

var datatable = $('#table_test').DataTable({
    scrollX:        "100%",
    scrollY:        200,
    scrollCollapse: true,
    autoWidth: 		false,
    paging:         false,
    sort:			false,
    info:			false,
    filter:			false,
    stripeClasses:	[]
});
new $.fn.dataTable.FixedColumns(datatable, {
    leftColumns: 1
});