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CSS

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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

              
                .wrapper
  .scroll-list
    .scroll-list__wrp.js-scroll-content.js-scroll-list
      - for (i = 0; i <= 55; i++)
        .scroll-list__item.js-scroll-list-item
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Roboto:400,500,700,900&subset=latin-ext');

html {
  position: relative;
  overflow-x: hidden !important;
}

body {
  font-family: 'Roboto', sans-serif;
  font-size: 16px;
  background: #f2f7fd;
}

a, a:hover {
  text-decoration: none;
}

* {
  box-sizing: border-box;
}

.wrapper {
  display: flex;
  align-items: center;
  min-height: 100vh;
  //background-color: #FA8BFF;
  //background-image: linear-gradient(45deg, #FA8BFF 0%, #2BD2FF 52%, #2BFF88 90%);
  //background-image: linear-gradient(45deg, #d4145a, #fbb03b);
     background-image: linear-gradient(-225deg, #231557 0%, #44107A 29%, #FF1361 67%, #fa9b48 100%);
}

.scroll-list {
  width: 100%;
  max-width: 700px;
  padding: 25px;
  margin-top: 50px;
  margin-left: auto;
  margin-right: auto;

  @media screen and (max-width: 768px) {
    margin-top: 20px
  }
  
  &__wrp {
    width: 100%;
    height: 700px;
    overflow: auto;
    padding: 50px;
 box-shadow: 0px 7px 46px 0px rgba(41, 53, 108, 0.45);
    background: #4b1079;
    background: #4b1079;
    margin-bottom: 15px;
    border-radius: 8px;
    background-image: linear-gradient(147deg, #6e0777 0%, #380c70 74%);
    .scrollbar-track {
      display: none!important;
    }

    @media screen and (max-width: 768px) {
      padding: 25px;
    }

  }

  &__item {
    width: 100%;
    height: 155px;
    display: block;
    margin-bottom: 15px;
    border-radius: 8px;
    background-image: linear-gradient(147deg, #ff7c34 0%, #c31269 74%);
    transition: all .35s ease-in-out;
    opacity: 0;
    transform: scale(0.7);
    box-shadow: 0px 7px 16px 0px rgba(41,53,108,0.25);

    &.item-hide {
      opacity: 0;
      transform: scale(.7);
    }

    &.item-focus {
      opacity: 1;
      transform: scale(1);
    }

    &.item-next {
      opacity: 1;
      transform: scale(1);

      & + .scroll-list__item {
        opacity: 1;
        transform: scale(1);
      }

    }

    &:last-child {
      margin-bottom: 155px;
    }

    //@media screen and (max-width: 768px) {
    //  width: 450px;
    //  margin-bottom: 0;
    //  margin-right: 15px;
    //  flex-shrink: 0;
    //  opacity: 1 !important;
    //  transform: none!important;
    //
    //  &:last-child {
    //    margin-bottom: 0;
    //    margin-right: 50px;
    //  }
    //
    //}

  }

}












              
            
!

JS

              
                $(document).ready(function () {
  var Scrollbar = window.Scrollbar;

  Scrollbar.use(window.OverscrollPlugin);

  var customScroll = Scrollbar.init(document.querySelector('.js-scroll-list'), {
    plugins: {
      overscroll: true
    }
  });

  var listItem = $('.js-scroll-list-item');

  listItem.eq(0).addClass('item-focus');
  listItem.eq(1).addClass('item-next');

  customScroll.addListener(function (status) {

    var $content = $('.js-scroll-content');

    var viewportScrollDistance = 0;


    viewportScrollDistance = status.offset.y;
    var viewportHeight = $content.height();
    var listHeight = 0;
    var $listItems = $content.find('.js-scroll-list-item');
    for (var i = 0; i < $listItems.length; i++) {
      listHeight += $($listItems[i]).height();
    }

    var top = status.offset.y;
    // console.log(top);
    var visibleCenterVertical = 0;
    visibleCenterVertical = top;

    var parentTop = 1;
    var $lis = $('.js-scroll-list-item');
    var $focusLi;
    for (var i = 0; i < $lis.length; i++) {
      var $li = $($lis[i]);
      var liTop = $li.position().top;
      var liRelTop = liTop - parentTop;

      var distance = 0;
      var distance = Math.abs(top - liRelTop);
      var maxDistance = $('.js-scroll-content').height() / 2;
      var distancePercent = distance / (maxDistance / 100);


      if (liRelTop + $li.parent().scrollTop() > top) {
        if (!$li.hasClass('item-focus')) {
          $li.prev().addClass('item-hide');
          $lis.removeClass('item-focus');
          $lis.removeClass('item-next');
        }
        $li.removeClass('item-hide');
        $li.addClass('item-focus');
        $li.next().addClass('item-next');
        break;
      }
    }
  });

});
              
            
!
999px

Console