a posição pegajosa
<!--In your stylesheets just add this one line:-->
<style>
thead th { position: sticky; top: 0; }
</style>
<table>
<thead>
<tr>
<th>column 1</th>
<th>column 2</th>
<th>column 3</th>
<th>column 4</th>
</tr>
</thead>
<tbody>
// your body code
</tbody>
</table>
Sandy4467