Photoswipeの矢印が消えたので復活したい

どこをいじって消えてしまったのかわからず、。見た目だけならｃｓｓでdisplay：ｎｏｎｅをけしたら出てきましたがスワイプしません。どのあたりを確認したら良いのか教えていただきたいです。

<div class="pswp" tabindex="-1" role="dialog" aria-hidden="true">
  <div class="pswp__bg"></div>
  <div class="pswp__scroll-wrap">
    <div class="pswp__container">
      <div class="pswp__item"></div>
      <div class="pswp__item"></div>
      <div class="pswp__item"></div>
    </div>
    <div class="pswp__ui pswp__ui--hidden">
      <div class="pswp__top-bar">
        <div class="pswp__counter"></div>
        <button class="pswp__button pswp__button--close" title="Close (Esc)"></button>
        <button class="pswp__button pswp__button--share" title="Share"></button>
        <button class="pswp__button pswp__button--fs" title="Toggle fullscreen"></button>
        <button class="pswp__button pswp__button--zoom" title="Zoom in/out"></button>
        <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)">
      </button>
      <button class="pswp__button pswp__button--arrow--right" title="Next (arrow right)">
      </button>
      <div class="pswp__caption">
        <div class="pswp__caption__center"></div>
      </div>
    </div>
  </div>
</div>

.pswp__ui--idle .pswp__button--arrow--left,
.pswp__ui--idle .pswp__button--arrow--right {
opacity: 0; }


.pswp__ui--hidden .pswp__top-bar,
.pswp__ui--hidden .pswp__caption,
.pswp__ui--hidden .pswp__button--arrow--left,
.pswp__ui--hidden .pswp__button--arrow--right {
opacity: 0.001; }

.pswp__ui--one-slide .pswp__button--arrow--left,
.pswp__ui--one-slide .pswp__button--arrow--right,
.pswp__ui--one-slide .pswp__counter {
display: none ; }

.pswp__element--disabled {
display: none !important; }

.pswp--minimal--dark .pswp__top-bar {
background: none; }
  { 
var _uiElements = [			
name: 'button--arrow--left', 
option: 'arrowEl',
onTap: pswp.prev
  	},
{ 
name: 'button--arrow--right', 
option: 'arrowEl',
onTap: pswp.next
  	},
var initPhotoSwipeFromDOM = function( gallerySelector ) {

  // parse slide data (url, title, size ...) from DOM elements 
  // (children of gallerySelector)
  var parseThumbnailElements = function(el) {
      var thumbElements = el.childNodes,
          numNodes = thumbElements.length,
          items = [],
          figureEl,
          linkEl,
          size,
          item;

      for(var i = 0; i < numNodes; i++) {

          figureEl = thumbElements[i]; // <figure> element

          // include only element nodes 
          if(figureEl.nodeType !== 1) {
              continue;
          }

          linkEl = figureEl.children[0]; // <a> element

          size = linkEl.getAttribute('data-size').split('x');

          // create slide object
          item = {
              src: linkEl.getAttribute('href'),
              w: parseInt(size[0], 10),
              h: parseInt(size[1], 10)
          };



          if(figureEl.children.length > 1) {
              // <figcaption> content
              item.title = figureEl.children[1].innerHTML; 
          }

          if(linkEl.children.length > 0) {
              // <img> thumbnail element, retrieving thumbnail url
              item.msrc = linkEl.children[0].getAttribute('src');
          } 

          item.el = figureEl; // save link to element for getThumbBoundsFn
          items.push(item);
      }

      return items;
  };

  // find nearest parent element
  var closest = function closest(el, fn) {
      return el && ( fn(el) ? el : closest(el.parentNode, fn) );
  };

  // triggers when user clicks on thumbnail
  var onThumbnailsClick = function(e) {
      e = e || window.event;
      e.preventDefault ? e.preventDefault() : e.returnValue = false;

      var eTarget = e.target || e.srcElement;

      // find root element of slide
      var clickedListItem = closest(eTarget, function(el) {
          return (el.tagName && el.tagName.toUpperCase() === 'FIGURE');
      });

      if(!clickedListItem) {
          return;
      }

      // find index of clicked item by looping through all child nodes
      // alternatively, you may define index via data- attribute
      var clickedGallery = clickedListItem.parentNode,
          childNodes = clickedListItem.parentNode.childNodes,
          numChildNodes = childNodes.length,
          nodeIndex = 0,
          index;

      for (var i = 0; i < numChildNodes; i++) {
          if(childNodes[i].nodeType !== 1) { 
              continue; 
          }

          if(childNodes[i] === clickedListItem) {
              index = nodeIndex;
              break;
          }
          nodeIndex++;
      }



      if(index >= 0) {
          // open PhotoSwipe if valid index found
          openPhotoSwipe( index, clickedGallery );
      }
      return false;
  };

  // parse picture index and gallery index from URL (#&pid=1&gid=2)
  var photoswipeParseHash = function() {
      var hash = window.location.hash.substring(1),
      params = {};

      if(hash.length < 5) {
          return params;
      }

      var vars = hash.split('&');
      for (var i = 0; i < vars.length; i++) {
          if(!vars[i]) {
              continue;
          }
          var pair = vars[i].split('=');  
          if(pair.length < 2) {
              continue;
          }           
          params[pair[0]] = pair[1];
      }

      if(params.gid) {
          params.gid = parseInt(params.gid, 10);
      }

      if(!params.hasOwnProperty('pid')) {
          return params;
      }
      params.pid = parseInt(params.pid, 10);
      return params;
  };

  var openPhotoSwipe = function(index, galleryElement, disableAnimation) {
      var pswpElement = document.querySelectorAll('.pswp')[0],
          gallery,
          options,
          items;

      items = parseThumbnailElements(galleryElement);

      // define options (if needed)
      options = {
          index: index,

          // define gallery index (for URL)
          galleryUID: galleryElement.getAttribute('data-pswp-uid'),

          getThumbBoundsFn: function(index) {
              // See Options -> getThumbBoundsFn section of documentation for more info
              var thumbnail = items[index].el.getElementsByTagName('img')[0], // find thumbnail
                  pageYScroll = window.pageYOffset || document.documentElement.scrollTop,
                  rect = thumbnail.getBoundingClientRect(); 

              return {x:rect.left, y:rect.top + pageYScroll, w:rect.width};
          }

      };

      if(disableAnimation) {
          options.showAnimationDuration = 0;
      }

      // Pass data to PhotoSwipe and initialize it
      gallery = new PhotoSwipe( pswpElement, PhotoSwipeUI_Default, items, options);
      gallery.init();
  };

  // loop through all gallery elements and bind events
  var galleryElements = document.querySelectorAll( gallerySelector );

  for(var i = 0, l = galleryElements.length; i < l; i++) {
      galleryElements[i].setAttribute('data-pswp-uid', i+1);
      galleryElements[i].onclick = onThumbnailsClick;
  }

  // Parse URL and open gallery if it contains #&pid=3&gid=1
  var hashData = photoswipeParseHash();
  if(hashData.pid > 0 && hashData.gid > 0) {
      openPhotoSwipe( hashData.pid - 1 ,  galleryElements[ hashData.gid - 1 ], true );
  }
};

// PhotoSwipeを起動する
initPhotoSwipeFromDOM( '.my-gallery' ) ;