JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
    <head>
        <style>
            table {
                border-collapse: collapse;
            }
            table th,
            table td {
                border: 1px solid black;
                padding: 4px;
                text-align:left;
            }
            thead tr:first-child th {
                font-size:2em;
            }
        </style>
    </head>
    <body>
        <table>
            <thead>
                <tr>
                    <th colspan="3">Arrangers</th>
                </tr>
                <tr>
                    <th>Name</th>
                    <th>School</th>
                    <th>E-mail address</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>Arranger One</td>
                    <td>This School</td>
                    <td>[email protected]</td>
                </tr>
            </tbody>
            <thead>
                <tr>
                    <th colspan="3">Teachers</th>
                </tr>
                <tr>
                    <th>Name</th>
                    <th>School</th>
                    <th>E-mail address</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>Teacher One</td>
                    <td>That School</td>
                    <td>[email protected]</td>
                </tr>
                <tr>
                    <td>Teacher Two with a very long name</td>
                    <td>Another School</td>
                    <td>[email protected]</td>
                </tr>
            </tbody>
            <thead>
                <tr>
                    <th colspan="3">Students</th>
                </tr>
                <tr>
                    <th>Name</th>
                    <th>School</th>
                    <th>E-mail address</th>
                </tr>
            </thead>
            <tbody>
                <tr>
                    <td>Student with an...