JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <thead>
    <tr>
        <th>Group Box</th>
    </tr>
    </thead>
    <tr>
        <td>blah <br/>blah <br/>blah <br/>blah <br/>blah <br/>blah <br/>blah <br/>blah <br/>blah <br/>blah</td>
    </tr>
</table>

CSS

table {
    border-collapse:separate;
    border:solid #2e6da4 1px;
    border-radius:6px;
    -moz-border-radius:6px;
}

td, th {
    
    border-left:solid #2e6da4 1px;
    border-top:solid #2e6da4 1px;
}

th {
    background-color: #337ab7;
    border-top: none;
}

td:first-child {
     border-left: none;
}