md_slider-1.5.4/templates/frontend/md-slider.html.twig

<div id="md-slider-{{ slid }}-block" class="md-slide-items" {{ attributes}} >
    <div class="wrap-loader-slider animated">
        <div class="wrap-cube">
            <div class="sk-cube-grid">
                <div class="sk-cube sk-cube1"></div>
                <div class="sk-cube sk-cube2"></div>
                <div class="sk-cube sk-cube3"></div>
                <div class="sk-cube sk-cube4"></div>
                <div class="sk-cube sk-cube5"></div>
                <div class="sk-cube sk-cube6"></div>
                <div class="sk-cube sk-cube7"></div>
                <div class="sk-cube sk-cube8"></div>
                <div class="sk-cube sk-cube9"></div>
            </div>
        </div>
    </div>
    {% for contentSlide in contentSlides %}
        {{ contentSlide }}
    {% endfor %}
</div>