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              <section class="slider-pages">

  <article class="js-scrolling__page js-scrolling__page-1 js-scrolling--active">
    <div class="slider-page slider-page--left">
      <div class="slider-page--skew">
        <div class="slider-page__content">
        </div>
        <!-- /.slider-page__content -->
      </div>
      <!-- /.slider-page--skew -->
    </div>
    <!-- /.slider-page slider-page--left -->

    <div class="slider-page slider-page--right">
      <div class="slider-page--skew">
        <div class="slider-page__content">
          <h1 class="slider-page__title slider-page__title--big">
            Gray & White - Skewed Slider with Scrolling
          </h1>
          <!-- /.slider-page__title slider-page__title--big -->
          <h2 class="slider-page__title">
            Start of your story
          </h2>
          <!-- /.slider-page__title -->
          <p class="slider-page__description">
            Please scroll down or press the down arrow on your keyboard
          </p>
          <!-- /.slider-page__description -->
        </div>
        <!-- /.slider-page__content -->
      </div>
      <!-- /.slider-page--skew -->
    </div>
    <!-- /.slider-page slider-page--right -->
  </article>
  <!-- /.js-scrolling__page js-scrolling__page-1 js-scrolling--active -->


  <article class="js-scrolling__page js-scrolling__page-2">
    <div class="slider-page slider-page--left">
      <div class="slider-page--skew">
        <div class="slider-page__content">
          <h1 class="slider-page__title">
            Now you are here
          </h1>
          <!-- /.slider-page__title -->
          <p class="slider-page__description">
            Please continue scrolling
          </p>
          <!-- /.slider-page__description -->
        </div>
        <!-- /.slider-page__content -->
      </div>
      <!-- /.slider-page--skew -->
    </div>
    <!-- /.slider-page slider-page--left -->

    <div class="slider-page slider-page--right">
      <div class="slider-page--skew">
        <div class="slider-page__content">
        </div>
        <!-- /.slider-page__content -->
      </div>
      <!-- /.slider-page--skew -->
    </div>
    <!-- /.slider-page slider-page--right -->
  </article>
  <!-- /.js-scrolling__page js-scrolling__page-2 -->


  <article class="js-scrolling__page js-scrolling__page-3">
    <div class="slider-page slider-page--left">
      <div class="slider-page--skew">
        <div class="slider-page__content">
        </div>
        <!-- /.slider-page__content -->
      </div>
      <!-- /.slider-page--skew -->
    </div>
    <!-- /.slider-page slider-page--left -->

    <div class="slider-page slider-page--right">
      <div class="slider-page--skew">
        <div class="slider-page__content">
          <h1 class="slider-page__title">
            Final is just the beginning
          </h1>
          <!-- /.slider-page__title -->
          <p class="slider-page__description">
            Feel free to follow me on <a class="slider-page__link" href="https://twitter.com/WispProxy"
                                         target="_blank">Twitter</a>
            and check of <a class="slider-page__link" href="https://codepen.io/WispProxy/pens/public"
                            target="_blank">my other works</a>
          </p>
          <!-- /.slider-page__description -->
        </div>
        <!-- /.slider-page__content -->
      </div>
      <!-- /.slider-page--skew -->
    </div>
    <!-- /.slider-page slider-page--right -->
  </article>
  <!-- /.js-scrolling__page js-scrolling__page-3 -->

</section>
<!-- /.slider-pages -->

            
          
!
            
              /***********************
 *	Variables
 **********************/
$font-family:             'Open Sans', sans-serif;
$font-size:               1em;

$color-body:              #282828;
$color-text:              #e2e2e2;
$color-link:              #80a1c1;
$color-link-active:       #6386a9;

$variable-skewX:          18deg;
$variable-vHForSkewX:     32.5vh;
$variable-scrollingTime:  1350ms;

/***********************
 *	Project Main Styles
 **********************/
*,
*:before,
*:after {
  box-sizing: border-box;
  margin:     0;
  padding:    0;
}

body {
  font-family:      $font-family;
  background-color: $color-body;
}

.slider-pages {
  overflow: hidden;
  position: relative;

  height:   100vh;
}

.slider-page {
  position:   absolute;

  top:        0;
  width:      50%;
  height:     100vh;

  transition: transform $variable-scrollingTime;
}

.slider-page--skew {
  overflow:   hidden;
  position:   absolute;

  top:        0;
  width:      140%;
  height:     100%;

  background: $color-body;

  transform:  skewX($variable-skewX * -1);
}

.slider-page--left {
  left:       0;

  transform:  translateX($variable-vHForSkewX * -1)
              translateY(100%)
              translateZ(0);

  .slider-page--skew {
    left:     -40%;
  }

  .slider-page__content {
    padding:          auto 30% auto 30%;

    transform-origin: 100% 0;
  }
}

.slider-page--right {
  left:       50%;

  transform:  translateX($variable-vHForSkewX)
              translateY(-100%)
              translateZ(0);

  .slider-page--skew {
    right:    -40%;
  }

  .slider-page__content {
    padding:          auto 30% auto 30%;

    transform-origin: 0 100%;
  }
}

.slider-page__content {
  position:         absolute;

  display:          flex;
  justify-content:  center;
  align-items:      center;
  flex-flow:        column wrap;

  top:      0;
  left:     0;
  width:    100%;
  height:   100%;
  padding:  0 30% 0 30%;

  color:            $color-text;
  background-size:  cover;

  transform:  skewX($variable-skewX);
  transition: transform $variable-scrollingTime;
}

.slider-page__title {
  margin-bottom: 1em;

  font-size:  $font-size;
  text-align: center;

  text-transform: uppercase;
}

.slider-page__title--big {
  font-size:  $font-size * 1.2;
}

.slider-page__description {
  font-size:  $font-size;
  text-align: center;
}

.slider-page__link {
  color:      $color-link;

  &:hover,
  &:focus {
    color:            $color-link-active;
    text-decoration:  none;
  }
}

/***********************
 *	Project JS Styles
 **********************/
.js-scrolling__page {
  position:   absolute;

  top:        0;
  left:       0;
  width:      100%;
}

.js-scrolling--active {

  .slider-page {
    transform:  translateX(0)
                translateY(0)
                translateZ(0);
  }
}

.js-scrolling--inactive {

  .slider-page__content {
    transform:  skewX($variable-skewX)
                scale(.9);
  }
}

.js-scrolling__page-1 {

  .slider-page--left .slider-page__content {
    background-image: url("https://s-media-cache-ak0.pinimg.com/originals/a6/6a/a3/a66aa3134eb9f439838e676297a75bd6.jpg");
  }

  .slider-page--right .slider-page__content {
    background-color: $color-body;
  }
}

.js-scrolling__page-2 {

  .slider-page--left .slider-page__content {
    background-color: $color-text;
  }
  .slider-page--left .slider-page__title,
  .slider-page--left .slider-page__description {
    color:            $color-body;
  }

  .slider-page--right .slider-page__content {
    background-image: url("https://s-media-cache-ak0.pinimg.com/originals/7a/8d/51/7a8d51f4968960334274ac7959d31a7d.jpg");
  }
}

.js-scrolling__page-3 {

  .slider-page--left .slider-page__content {
    background-image: url("https://s-media-cache-ak0.pinimg.com/originals/4c/d8/7b/4cd87bc93cca92f76285c061cef16585.jpg");
  }

  .slider-page--right .slider-page__content {
    background-color: $color-body;
  }
}

            
          
!
            
              /*********************
 *	Helpers Code
 ********************/
/**
 *  @function   DOMReady
 *
 *  @param callback
 *  @param element
 *  @param listener
 *  @returns {*}
 *  @constructor
 */
const DOMReady = ((
  callback  = () => {},
  element   = document,
  listener  = 'addEventListener'
) => {
  return (element[listener]) ? element[listener]('DOMContentLoaded', callback) : window.attachEvent('onload', callback);
});

/**
 *  @function   ProjectAPI
 *
 *  @type {{hasClass, addClass, removeClass}}
 */
const ProjectAPI = (() => {
  let hasClass,
      addClass,
      removeClass;

  hasClass = ((el, className) => {
    if (el === null) {
      return;
    }

    if (el.classList) {
      return el.classList.contains(className);
    }
    else {
      return !!el.className.match(new RegExp('(\\s|^)' + className + '(\\s|$)'));
    }
  });

  addClass = ((el, className) => {
    if (el === null) {
      return;
    }

    if (el.classList) {
      el.classList.add(className);
    }
    else if (!hasClass(el, className)) {
      el.className += ' ' + className
    }
  });

  removeClass = ((el, className) => {
    if (el === null) {
      return;
    }

    if (el.classList) {
      el.classList.remove(className);
    }
    else if (hasClass(el, className)) {
      let reg = new RegExp('(\\s|^)' + className + '(\\s|$)');

      el.className = el.className.replace(reg, ' ');
    }
  });

  return {
    hasClass:     hasClass,
    addClass:     addClass,
    removeClass:  removeClass
  };
})();


/*********************
 *	Application Code
 ********************/
/**
 *  @function   readyFunction
 *
 *  @type {Function}
 */
const readyFunction = (() => {

  const KEY_UP    = 38;
  const KEY_DOWN  = 40;

  let scrollingClass          = 'js-scrolling',
      scrollingActiveClass    = scrollingClass + '--active',
      scrollingInactiveClass  = scrollingClass + '--inactive',

      scrollingTime           = 1350,
      scrollingIsActive       = false,

      currentPage             = 1,
      countOfPages            = document.querySelectorAll('.' + scrollingClass + '__page').length,

      prefixPage              = '.' + scrollingClass + '__page-',

      _switchPages,
      _scrollingUp,
      _scrollingDown,

      _mouseWheelEvent,
      _keyDownEvent,

      init;

  /**
   *  @function _switchPages
   *
   *  @private
   */
  _switchPages = () => {

    let _getPageDomEl;

	  /**
     *  @function _getPageDomEl
     *
     *  @param page
     *  @returns {Element}
     *  @private
	   */
    _getPageDomEl      = (page = currentPage) => {
      return document.querySelector(prefixPage + page);
    };

    scrollingIsActive  = true;


    ProjectAPI.removeClass(
      _getPageDomEl(),
      scrollingInactiveClass
    );
    ProjectAPI.addClass(
      _getPageDomEl(),
      scrollingActiveClass
    );

    ProjectAPI.addClass(
      _getPageDomEl(currentPage - 1),
      scrollingInactiveClass
    );

    ProjectAPI.removeClass(
      _getPageDomEl(currentPage + 1),
      scrollingActiveClass
    );


    setTimeout(
      () => {
        return scrollingIsActive = false;
      },
      scrollingTime
    );
  };
	/**
   *  @function _scrollingUp
   *
   *  @private
   */
  _scrollingUp = () => {
    if (currentPage === 1) {
      return;
    }

    currentPage--;

    _switchPages();
  };
	/**
   *  @function _scrollingDown
   *
   *  @private
   */
  _scrollingDown = () => {
    if (currentPage === countOfPages) {
      return;
    }

    currentPage++;

    _switchPages();
  };
	/**
   *  @function _mouseWheelEvent
   *
   *  @param e
   *  @private
   */
  _mouseWheelEvent = (e) => {
    if (scrollingIsActive) {
      return;
    }

    if (e.wheelDelta > 0 || e.detail < 0) {
      _scrollingUp();
    }
    else if (e.wheelDelta < 0 || e.detail > 0) {
      _scrollingDown();
    }
  };
	/**
   *  @function _keyDownEvent
   *
   *  @param e
   *  @private
   */
  _keyDownEvent = (e) => {
    if (scrollingIsActive) {
      return;
    }

    let keyCode = e.keyCode || e.which;

    if (keyCode === KEY_UP) {
      _scrollingUp();
    }
    else if (keyCode === KEY_DOWN) {
      _scrollingDown();
    }
  };

  /**
   *  @function init
   *
   *  @note     auto-launch
   */
  init = (() => {
    document.addEventListener(
      'mousewheel',
      _mouseWheelEvent,
      false
    );
    document.addEventListener(
      'DOMMouseScroll',
      _mouseWheelEvent,
      false
    );

    document.addEventListener(
      'keydown',
      _keyDownEvent,
      false
    );
  })();

});


/**
 *  Launcher
 */
DOMReady(readyFunction);

            
          
!
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