JSFiddle - React, Tailwind, and code Playground

by ltdeta

HTML

<table id="x" class='objectTable'>
  <thead>
        <th>1</th>
        <th>2</th>
    </thead>
  <tbody>
    <tr>
        <th>A</th>
        <th>B</th>
    </tr>
    <tr>
        <td>1</td>
        <td>2</td>
    </tr>
    </tbody>
</table>

CSS

.x th:first-child
{
    background-color: blue;
    color: white;
}

.x tbody tr:first-child th:first-child
{
    background-color: red;
}