Vertical slider

<div class="skw-pages">
  <div class="skw-page skw-page-1 active">
    <div class="skw-page__half skw-page__half--left">
      <div class="skw-page__skewed">
        <div class="skw-page__content"></div>
      </div>
    </div>
    <div class="skw-page__half skw-page__half--right">
      <div class="skw-page__skewed">
        <div class="skw-page__content">
          <h2 class="skw-page__heading">Skewed One Page Scroll</h2>
          <p class="skw-page__description">Just scroll down</p>
        </div>
      </div>
    </div>
  </div>
  <div class="skw-page skw-page-2">
    <div class="skw-page__half skw-page__half--left">
      <div class="skw-page__skewed">
        <div class="skw-page__content">
          <h2 class="skw-page__heading">Page 2</h2>
          <p class="skw-page__description">Nothing to do here, continue scrolling.</p>
        </div>
      </div>
    </div>
    <div class="skw-page__half skw-page__half--right">
      <div class="skw-page__skewed">
        <div class="skw-page__content"></div>
      </div>
    </div>
  </div>
  <div class="skw-page skw-page-3">
    <div class="skw-page__half skw-page__half--left">
      <div class="skw-page__skewed">
        <div class="skw-page__content"></div>
      </div>
    </div>
    <div class="skw-page__half skw-page__half--right">
      <div class="skw-page__skewed">
        <div class="skw-page__content">
          <h2 class="skw-page__heading">Page 3</h2>
          <p class="skw-page__description">The end is near, I promise!</p>
        </div>
      </div>
    </div>
  </div>
  <div class="skw-page skw-page-4">
    <div class="skw-page__half skw-page__half--left">
      <div class="skw-page__skewed">
        <div class="skw-page__content">
          <h2 class="skw-page__heading">Page 4</h2>
          <p class="skw-page__description">Ok, ok, just one more scroll!</p>
        </div>
      </div>
    </div>
    <div class="skw-page__half skw-page__half--right">
      <div class="skw-page__skewed">
        <div class="skw-page__content"></div>
      </div>
    </div>
  </div>
  <div class="skw-page skw-page-5">
    <div class="skw-page__half skw-page__half--left">
      <div class="skw-page__skewed">
        <div class="skw-page__content"></div>
      </div>
    </div>
    <div class="skw-page__half skw-page__half--right">
      <div class="skw-page__skewed">
        <div class="skw-page__content">
          <h2 class="skw-page__heading">Epic finale</h2>
        </div>
      </div>
    </div>
  </div>
</div>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
//Скрипт js надо подключать здесь
//Автор: Nikolay Talanov. @suez

*, *:before, *:after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: #15181A;
  font-family: "Open Sans", Helvetica, Arial, sans-serif;
}

.skw-pages {
  overflow: hidden;
  position: relative;
  height: 100vh;
}

.skw-page {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
}
.skw-page__half {
  position: absolute;
  top: 0;
  width: 50%;
  height: 100vh;
  transition: transform 1s;
}
.skw-page__half--left {
  left: 0;
  transform: translate3d(-32.4vh, 100%, 0);
}
.skw-page__half--right {
  left: 50%;
  transform: translate3d(32.4vh, -100%, 0);
}
.skw-page.active .skw-page__half {
  transform: translate3d(0, 0, 0);
}
.skw-page__skewed {
  overflow: hidden;
  position: absolute;
  top: 0;
  width: 140%;
  height: 100%;
  transform: skewX(-18deg);
  background: #000;
}
.skw-page__half--left .skw-page__skewed {
  left: -40%;
}
.skw-page__half--right .skw-page__skewed {
  right: -40%;
}
.skw-page__content {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-flow: column wrap;
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  padding: 0 30%;
  color: #fff;
  transform: skewX(18deg);
  transition: transform 1s, opacity 1s;
  background-size: cover;
}
.skw-page__half--left .skw-page__content {
  padding-left: 30%;
  padding-right: 30%;
  transform-origin: 100% 0;
}
.skw-page__half--right .skw-page__content {
  padding-left: 30%;
  padding-right: 30%;
  transform-origin: 0 100%;
}
.skw-page.inactive .skw-page__content {
  opacity: 0.5;
  transform: skewX(18deg) scale(0.95);
}
.skw-page__heading {
  margin-bottom: 15px;
  text-transform: uppercase;
  font-size: 25px;
  text-align: center;
}
.skw-page__description {
  font-size: 18px;
  text-align: center;
}
.skw-page__link {
  color: #FFA0A0;
}
.skw-page-1 .skw-page__half--left .skw-page__content {
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/mousover-img-1.jpg");
}
.skw-page-1 .skw-page__half--right .skw-page__content {
  background: #292929;
}
.skw-page-2 .skw-page__half--left .skw-page__content {
  background: #292929;
}
.skw-page-2 .skw-page__half--right .skw-page__content {
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/slider-2.jpg");
}
.skw-page-3 .skw-page__half--left .skw-page__content {
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/mousover-img-2.jpg");
}
.skw-page-3 .skw-page__half--right .skw-page__content {
  background: #292929;
}
.skw-page-4 .skw-page__half--left .skw-page__content {
  background: #292929;
}
.skw-page-4 .skw-page__half--right .skw-page__content {
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/sections-3.jpg");
}
.skw-page-5 .skw-page__half--left .skw-page__content {
  background-image: url("https://s3-us-west-2.amazonaws.com/s.cdpn.io/142996/img-test.jpg");
}
.skw-page-5 .skw-page__half--right .skw-page__content {
  background: #292929;
}

$(document).ready(function () {
  var curPage = 1;
  var numOfPages = $(".skw-page").length;
  var animTime = 1000;
  var scrolling = false;
  var pgPrefix = ".skw-page-";

  function pagination() {
    scrolling = true;

    $(pgPrefix + curPage)
      .removeClass("inactive")
      .addClass("active");
    $(pgPrefix + (curPage - 1)).addClass("inactive");
    $(pgPrefix + (curPage + 1)).removeClass("active");

    setTimeout(function () {
      scrolling = false;
    }, animTime);
  }

  function navigateUp() {
    if (curPage === 1) return;
    curPage--;
    pagination();
  }

  function navigateDown() {
    if (curPage === numOfPages) return;
    curPage++;
    pagination();
  }

  $(document).on("mousewheel DOMMouseScroll", function (e) {
    if (scrolling) return;
    if (e.originalEvent.wheelDelta > 0 || e.originalEvent.detail < 0) {
      navigateUp();
    } else {
      navigateDown();
    }
  });

  $(document).on("keydown", function (e) {
    if (scrolling) return;
    if (e.which === 38) {
      navigateUp();
    } else if (e.which === 40) {
      navigateDown();
    }
  });
});