table fixed header

1.tableFixHead thead th { position: sticky; top: 0; }

1/*Simply*/  position:sticky; top: 0; /*your th elements*/

1.tableFixHead          { overflow: auto; height: 100px; }
2.tableFixHead thead th { position: sticky; top: 0; z-index: 1; }
3
4/* Just common table stuff. Really. */
5table  { border-collapse: collapse; width: 100%; }
6th, td { padding: 8px 16px; }
7th     { background:#eee; }

1table tbody { display:block; max-height:450px; overflow-y:scroll; }
2table thead, table tbody tr { display:table; width:100%; table-layout:fixed; }
3

1<div class="tableFixHead">
2  <table>
3    <thead>
4      <tr><th>TH 1</th><th>TH 2</th></tr>
5    </thead>
6    <tbody>
7      <tr><td>A1</td><td>A2</td></tr>
8      <tr><td>B1</td><td>B2</td></tr>
9      <tr><td>C1</td><td>C2</td></tr>
10      <tr><td>D1</td><td>D2</td></tr>
11      <tr><td>E1</td><td>E2</td></tr>
12    </tbody>
13  </table>
14</div>