JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://rawgithub.com/watilde/bootstrap/fixes-11970-better/dist/css/bootstrap.min.css">
<div class="panel panel-primary">
  <div class="panel-heading text-center">
    panel-heading
  </div>
  <table class="table">
    <tr>
      <td class="active">td</td>
    </tr>
  </table>
  <table class="table">
    <tr>
      <td class="active">td</td>
    </tr>
  </table>
</div>

CSS

.panel {
    margin: 50px;
    background-color: #000;
}