<table>
  <thead>
    <tr>
      <th>Month</th>
      <th>Savings</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td colspan="2">
        <div class="scroll">
          <table>
            <tbody>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
              <tr>
                <td>January</td>
                <td>$100</td>
              </tr>
              <tr>
                <td>February</td>
                <td>$80</td>
              </tr>
            </tbody>
          </table>
        </div>
      </td>
    </tr>
  </tbody>
</table>
.scroll {
  overflow: auto;
  height: 300px;
}

table {
  width: 500px;
  margin-bottom: 1rem;
  color: #212529;
  table-layout: fixed;
}
table th {
  text-align: left;
  padding: 0.75rem;
  padding-left: 0;
  vertical-align: top;
}
table td {
  text-align: left;
  padding: 0.75rem;
  padding-left: 0;
  vertical-align: top;
}
table td[colspan] {
  padding: 0;
}
table thead th {
  vertical-align: bottom;
  border-bottom: 1px solid #dee2e6;
}

External CSS

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External JavaScript

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