JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <thead>
        <th>Test 1</th>
        <th>Test 2</th>
        <th>Test 3</th>
    </thead>
    <tbody>
        <tr>
            <td>asdasd</td>
            <td>adasdasd</td>
            <td>adasdasd</td>
        </tr>
    </tbody>
</table>

CSS

table{
    border-spacing: 0;
    border-collapse: collapse;
    background: #efefef;
}

th {
    background:#ccc;
    border-right: 1px #000 solid;
    transform: translate(-10px, 0);
}