JSFiddle - React, Tailwind, and code Playground

HTML

<table>
  <thead>
    <tr>
      <th>AColumnLongWord</th>
      <th>AnotherColumnLongWord</th>
      <th>AColumnLongWord</th>
      <th>AColumnLongWord</th>
      <th>AColumnLongWord</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Data</td>
      <td>Data more</td>
      <td>Data even more</td>
      <td>1</td>
      <td>€ 50</td>
    </tr>
  </tbody>
</table>

CSS

table {
  width: 100%;
}

th {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  max-width: 0;
  text-align: left;
}

th:hover {
  background-color: InfoBackground;
  color: InfoText;
  overflow: visible;
  position: absolute;
  max-width: 100%;
}