beflask/app/results/templates/_table_datasets.html

<table id="report-table"
       class="table table-striped table-hover table-bordered bg-light">
    <thead>
        <tr class="bg-primary text-white">
            <th class="text-center">Dataset</th>
            <th class="text-center">Samples</th>
            <th class="text-center">Features</th>
            <th class="text-center">Cont. Feat.</th>
            <th class="text-center">Classes</th>
            <th class="text-center">Balance</th>
        </tr>
    </thead>
    <tbody>
        {% for dataset in datasets %}
            <tr>
                <td>{{ dataset.dataset }}</td>
                <td class="text-end">{{ "{:,}".format(dataset.samples) }}</td>
                <td class="text-end">{{ "{:,}".format(dataset.features) }}</td>
                <td class="text-end">{{ dataset.cont_features }}</td>
                <td class="text-end">{{ dataset.classes }}</td>
                <td>{{ dataset.balance }}</td>
            </tr>
        {% endfor %}
    </tbody>
</table>