ot_typo3/ot_templating/Resources/Private/Layouts/Modern/3Col.html

<f:comment><!-- base layout for a page, with header, carousel, navbar, breadcrumb and footer --></f:comment>
<f:layout name="3Col" />

<div class="t-container st-effect-3">

    <f:comment><!-- Render the header defined in partials/Header.html--></f:comment>
    <f:render partial="Modern/Header" arguments="{_all}" />

    <f:comment><!-- Render content --></f:comment>
    <section class="page-section-ptb">
        <div class="container">
            <div class="row">
                <div class="col-sm-12 mt-30">
                    <f:comment><!-- render the content of the content section (middle column) --></f:comment>
                    <f:render section="Content" />
                </div>
            </div>
        </div>
    </section>

    <f:comment><!-- Render the footer defined in partials/footer.html--></f:comment>
    <f:render partial="Modern/Footer" />

</div>