JSFiddle - React, Tailwind, and code Playground

HTML

<div class="grid">

  <div class="table-header">Шапка, для таблицы, ее нельзя убирать</div>
  <div class="container">
  <div class="table-first">
    <table>
      <tbody>
        <tr>
          <td>table-first</td>
        </tr><tr>
          <td>table-first</td>
        </tr>      <tr>
          <td>table-first</td>
        </tr><tr>
          <td>table-first</td>
        </tr>      <tr>
          <td>table-first</td>
        </tr><tr>
          <td>table-first</td>
        </tr>      <tr>
          <td>table-first</td>
        </tr><tr>
          <td>table-first</td>
        </tr>      <tr>
          <td>table-first</td>
        </tr><tr>
          <td>table-first</td>
        </tr>      <tr>
          <td>table-first</td>
        </tr><tr>
          <td>table-first</td>
        </tr>
      </tbody>
    </table>
  </div>
  <div class="table-second">
    <table>
      <tbody>
        <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr> <tr>
          <td>table-second</td>
        </tr>
      </tbody>

    </table>
  </div>
  </div>
</div>

CSS

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

.container {
  display:flex;
  flex-direction: column;
  border:1px dashed red;
  width: 100%;
  height: 100%;
}

.grid {
  width: 400px;
  height: 400px;
  border: 1px solid red;
  display: flex;
  flex-direction: column;
}

.table-header {
  border: 1px solid black;
  min-height: 40px;
}

 

.table-first {
  overflow: auto;
  border:2px solid green;
  max-height: 50%;
 
 
}

.table-second {
  overflow: scroll;
  flex: 1;
    border:2px solid pink;
}