photoswipe-container.html.twig in PhotoSwipe 3.x

{# Root element of PhotoSwipe. Must have class pswp. #}
<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">

  {#
    Background of PhotoSwipe.
    It's a separate element as animating opacity is faster than rgba().
  #}
  <div class="pswp__bg"></div>

  {# Slides wrapper with overflow:hidden. #}
  <div class="pswp__scroll-wrap">

    {#
      Container that holds slides.
      PhotoSwipe keeps only 3 of them in the DOM to save memory.
      Don't modify these 3 pswp__item elements, data is added later on.
    #}

    <div class="pswp__container">
      <div class="pswp__item"></div>
      <div class="pswp__item"></div>
      <div class="pswp__item"></div>
    </div>

    {#
      Default (PhotoSwipeUI_Default) interface on top of sliding area.
      Can be changed.
    #}
    <div class="pswp__ui pswp__ui--hidden">

      <div class="pswp__top-bar">

        {# Controls are self-explanatory. Order can be changed. #}

        <div class="pswp__counter"></div>

        <button class="pswp__button pswp__button--close" title="{{ 'Close (Esc)'|t }}"></button>

        <button class="pswp__button pswp__button--share" title="{{ 'Share'|t }}"></button>

        <button class="pswp__button pswp__button--fs" title="{{ 'Toggle fullscreen'|t }}"></button>

        <button class="pswp__button pswp__button--zoom" title="{{ 'Zoom in/out'|t }}"></button>

        {#
          Preloader demo http://codepen.io/dimsemenov/pen/yyBWoR
          Element will get class pswp__preloader--active when preloader is
          running.
        #}

        <div class="pswp__preloader">
          <div class="pswp__preloader__icn">
            <div class="pswp__preloader__cut">
              <div class="pswp__preloader__donut"></div>
            </div>
          </div>
        </div>
      </div>

      <div class="pswp__share-modal pswp__share-modal--hidden pswp__single-tap">
        <div class="pswp__share-tooltip"></div>
      </div>

      <button class="pswp__button pswp__button--arrow--left" title="{{ 'Previous (arrow left)'|t }}">
      </button>

      <button class="pswp__button pswp__button--arrow--right" title="{{ 'Next (arrow right)'|t }}">
      </button>

      <div class="pswp__caption">
        <div class="pswp__caption__center"></div>
      </div>

    </div>

  </div>

</div>