sijad it doesn't accept tables
try this codes
.tg {border-collapse:collapse;border-spacing:0;}
.tg td{font-family:Arial, sans-serif;font-size:14px;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;}
.tg th{font-family:Arial, sans-serif;font-size:14px;font-weight:normal;padding:10px 5px;border-style:solid;border-width:1px;overflow:hidden;word-break:normal;}
.tg .tg-yw4l{vertical-align:top}
</style>
<table class="tg">
<tr>
<th class="tg-yw4l"></th>
<th class="tg-yw4l"></th>
<th class="tg-yw4l"></th>
<th class="tg-yw4l"></th>
<th class="tg-yw4l"></th>
</tr>
<tr>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
</tr>
<tr>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
</tr>
<tr>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
<td class="tg-yw4l"></td>
</tr>
</table>