<!--

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-->
<div class="split-slideshow">
  <div class="slideshow">
    <div class="slider">
      <div class="item">
        <img src="https://raw.githubusercontent.com/supahfunk/supah-codepen/master/canyon-2.jpg" />
      </div>
      <div class="item">
        <img src="https://raw.githubusercontent.com/supahfunk/supah-codepen/master/canyon-3.jpg" />
      </div>
      <div class="item">
        <img src="https://raw.githubusercontent.com/supahfunk/supah-codepen/master/canyon-4.jpg" />
      </div>
      <div class="item">
        <img src="https://raw.githubusercontent.com/supahfunk/supah-codepen/master/canyon-1.jpg" />
      </div>
    </div>
  </div>
  <div class="slideshow-text">
    <div class="item">Canyon</div>
    <div class="item">Desert</div>
    <div class="item">Erosion</div>
    <div class="item">Shape</div>
  </div>
</div>

<a class="the-most" target="_blank" href="https://codepen.io/2017/popular/pens/10/">
  <img src="https://raw.githubusercontent.com/supahfunk/supah-codepen/master/themost-2017.png">
</a>
body,
html {
  height: 100%;
  background: #110101;
  font-family: 'Roboto', sans-serif;
  overflow: hidden;
}

.slideshow {
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  
  .slider {
    width: 100vw;
    height: 100vw;
    z-index: 2;
    
    * {
      outline: none;
    }
    
    .item {
      height: 100vh;
      width: 100vw;
      position: relative;
      overflow: hidden;
      border: none;
      
      .text {
        display: none;
      }
      
      img {
        min-width: 101%;
        min-height: 101%;
        position: absolute;
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%);
      }
    }
  }
  
  .slick-dots {
    position: fixed;
    z-index: 100;
    width: 40px;
    height: auto;
    bottom: auto;
    top: 50%;
    right: 0;
    transform: translateY(-50%);
    left: auto;
    color: #fff;
    display: block;
    
    li {
      display: block;
      width: 100%;
      height: auto;
      
      & button {
        position: relative;
        width: 20px;
        height: 15px;
        text-align: center;
        
        &:before {
          content: '';
          background: #fff;
          color: #fff;
          height: 2px;
          width: 20px;
          border-radius: 0;
          position: absolute;
          top: 50%;
          right: 0;
          left: auto;
          transform: translateY(-50%);
          transition: all .3s ease-in-out;
          opacity: 0.6;
        }
      }
      
      &.slick-active {
        button {
          &:before {
            width: 40px;
            opacity: 1;
          }
        }
      }
    }
  }
  
  &.slideshow-right {
    left: 0;
    z-index: 1;
    width: 50vw;
    pointer-events: none;
    
    .slider {
      left: 0;
      position: absolute;
    }
  }
}

.slideshow-text {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: 100;
  font-size: 80px;
  width: 100vw;
  text-align: center;
  color: #fff;
  font-family: 'Roboto Condensed', sans-serif;
  font-weight: 100;
  pointer-events: none;
  text-transform: uppercase;
  letter-spacing: 20px;
  line-height: 0.8;
  
  @media (max-width: 767px) {
    font-size: 40px;
  }
  
}


.the-most {
  position: fixed;
  z-index: 1;
  bottom: 0;
  left: 0;
  width: 50vw;
  max-width: 200px;
  padding: 10px;
  
  img {
    max-width: 100%;
  }
}
View Compiled
var $slider = $('.slideshow .slider'),
  maxItems = $('.item', $slider).length,
  dragging = false,
  tracking,
  rightTracking;

$sliderRight = $('.slideshow').clone().addClass('slideshow-right').appendTo($('.split-slideshow'));

rightItems = $('.item', $sliderRight).toArray();
reverseItems = rightItems.reverse();
$('.slider', $sliderRight).html('');
for (i = 0; i < maxItems; i++) {
  $(reverseItems[i]).appendTo($('.slider', $sliderRight));
}

$slider.addClass('slideshow-left');
$('.slideshow-left').slick({
  vertical: true,
  verticalSwiping: true,
  arrows: false,
  infinite: true,
  dots: true,
  speed: 1000,
  cssEase: 'cubic-bezier(0.7, 0, 0.3, 1)'
}).on('beforeChange', function(event, slick, currentSlide, nextSlide) {

  if (currentSlide > nextSlide && nextSlide == 0 && currentSlide == maxItems - 1) {
    $('.slideshow-right .slider').slick('slickGoTo', -1);
    $('.slideshow-text').slick('slickGoTo', maxItems);
  } else if (currentSlide < nextSlide && currentSlide == 0 && nextSlide == maxItems - 1) {
    $('.slideshow-right .slider').slick('slickGoTo', maxItems);
    $('.slideshow-text').slick('slickGoTo', -1);
  } else {
    $('.slideshow-right .slider').slick('slickGoTo', maxItems - 1 - nextSlide);
    $('.slideshow-text').slick('slickGoTo', nextSlide);
  }
}).on("mousewheel", function(event) {
  event.preventDefault();
  if (event.deltaX > 0 || event.deltaY < 0) {
    $(this).slick('slickNext');
  } else if (event.deltaX < 0 || event.deltaY > 0) {
    $(this).slick('slickPrev');
  };
}).on('mousedown touchstart', function(){
  dragging = true;
  tracking = $('.slick-track', $slider).css('transform');
  tracking = parseInt(tracking.split(',')[5]);
  rightTracking = $('.slideshow-right .slick-track').css('transform');
  rightTracking = parseInt(rightTracking.split(',')[5]);
}).on('mousemove touchmove', function(){
  if (dragging) {
    newTracking = $('.slideshow-left .slick-track').css('transform');
    newTracking = parseInt(newTracking.split(',')[5]);
    diffTracking = newTracking - tracking;
    $('.slideshow-right .slick-track').css({'transform': 'matrix(1, 0, 0, 1, 0, ' + (rightTracking - diffTracking) + ')'});
  }
}).on('mouseleave touchend mouseup', function(){
  dragging = false;
});

$('.slideshow-right .slider').slick({
  swipe: false,
  vertical: true,
  arrows: false,
  infinite: true,
  speed: 950,
  cssEase: 'cubic-bezier(0.7, 0, 0.3, 1)',
  initialSlide: maxItems - 1
});
$('.slideshow-text').slick({
  swipe: false,
  vertical: true,
  arrows: false,
  infinite: true,
  speed: 900,
  cssEase: 'cubic-bezier(0.7, 0, 0.3, 1)'
});

Run Pen

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.min.css
  2. https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick-theme.min.css
  3. https://fonts.googleapis.com/css?family=Roboto+Condensed:100

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.1.1/jquery.min.js
  2. https://cdnjs.cloudflare.com/ajax/libs/jquery-mousewheel/3.1.12/jquery.mousewheel.js
  3. https://cdnjs.cloudflare.com/ajax/libs/slick-carousel/1.6.0/slick.min.js