Bootstrap CSS class .thead-light

<table class="table">
  <thead class="thead-light">
    <tr>
      <th>#</th>
      <th>First Name</th>
      <th>Last Name</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <th scope="row">1</th>
      <td>Mark</td>
      <td>Otto</td>
    </tr>
    <tr>
      <th scope="row">2</th>
      <td>Jacob</td>
      <td>Thornton</td>
    </tr>
  </tbody>
</table>

/* _tables.scss:123 */
.thead-light {
  th {
    color: $table-head-color;
    background-color: $table-head-bg;
    border-color: $table-border-color;
  }
}