wp-bootstrap/views/partials/post-navigation.html.twig

{% if post_navigation is defined and post_navigation|length > 0 %}
<nav class="border-top border-bottom py-4 my-4" aria-label="{{ __('Post navigation') }}">
    <div class="row">
        <div class="col-6">
            {% if post_navigation.previous is defined %}
                <small class="text-body-secondary d-block mb-1">{{ __('Previous') }}</small>
                <a href="{{ post_navigation.previous.url }}" class="text-decoration-none">
                    &larr; {{ post_navigation.previous.title }}
                </a>
            {% endif %}
        </div>
        <div class="col-6 text-end">
            {% if post_navigation.next is defined %}
                <small class="text-body-secondary d-block mb-1">{{ __('Next') }}</small>
                <a href="{{ post_navigation.next.url }}" class="text-decoration-none">
                    {{ post_navigation.next.title }} &rarr;
                </a>
            {% endif %}
        </div>
    </div>
</nav>
{% endif %}