JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <thead>
        <tr>
            <td></td>
        </tr>
    </thead>
    <tbody>
      <tr>
        <td class="label">My Label</td>
        <td class="content">
            Overlay some div on top of this element
            <div class="over"><div>
        </td>
      </tr>
    </tbody>
</table>

CSS

td.content {
    position: relative;
}
div.over {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: red;
}