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HTML 

              
                <div class="horizontal-parent">
  
  <div class="horizontal-child">
    
    <div class="slide">
      <hgroup class="slide-heading">
        <h1>Head over heels</h1>
        <h2>Scroll down to scroll right</h2>
      </hgroup>
    </div>
    
    <figure class="slide">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/46992/hand-right.svg" alt="" />
    </figure>
    
    <div class="slide">
      <hgroup class="slide-heading">
        <h2>Experience the magic of CSS</h2>
      </hgroup>
    </div>
    
    <figure class="slide">
      <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/46992/hand-left.svg" alt="" />
    </figure>
    
  </div>
  
</div>
!

CSS 

              
                @import url(https://fonts.googleapis.com/css?family=Roboto:300);

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

body {
  font-family: 'Roboto', sans-serif;
  color:white;
}

body, .horizontal-parent {overflow:hidden;}

.horizontal-parent {
  position:absolute;
  top:0;
  left:0;
  width:100vw;
  height:100vh;
}

// number of slides
$slides:4;

// This is the wrapper for the slides
.horizontal-child {
  position:relative;
  display:block;
  width:100vh;
  height:100vw;
  overflow:scroll;
  transform-origin:100% 0%;
  transform:rotate(-90deg) translateY(-100vh);
  
  // each slide should be the size of the viewport
  .slide {
    z-index:2;
    display:flex;
    position:absolute;
    width:100vw;
    height:100vh;
    overflow:hidden;
    text-align:center;
    transform-origin:0% 0%;
    
    &:after {
      content:'';
      position:absolute;
      background-image:linear-gradient(#A2BA0C, #A2BA0C);
      // background-attachment fixed does the magic on the background
      background-attachment:fixed;
      background-position:0 0;
      background-repeat:no-repeat;
      z-index:-1;
    }

    // As every .slide is positioned absolute, we translate each on the x-axis
    // by nth * viewport-width >> so they sit next to each other
    // like this: □□□□
    // + rotate them by 90deg
    // + slide them up by translate them on the y-axis by 100 viewport-height
    @for $slide from 1 through $slides {
      $perc:1 / $slides;
      $i: ($slide - 1) * $perc;
      $color:adjust-hue( red, ($slide * 10%) );
      &:nth-child(#{$slide}) {
        transform:rotate(90deg) translateY(-100%) translateX(($slide - 1) * 99.9vw);
        background-color:$color;
        
        // trail and error
        // there's a logic behind it, but I got screwed up by all the rotations
        &:after {
          top: $slide * -100%;
          left: $slide * -100%;
          width: $slide * 200%;
          height: $slide * 200%;
          background-size:($slide * 200%) ($slide * 200%);
          transform:scale(1-$i);
        }
      }    
    }
  
  // center the content of each slide
  // remember: we set the parent element to display:flex
  .slide-heading {
    margin:auto;
  }

  img {
      display:block;
      width:50%;
      height:auto;
      margin:auto;
    }
  }
}

#hand-left {fill:red;}

// Some styling

.slide-heading h1 {
  font-size:7vw;
  font-weight:300;
  text-transform:uppercase;
  letter-spacing:1vw;
  transform:rotate(180deg);
}

.slide-heading h2 {
  font-size:2vw;
  font-weight:300;
  text-transform:uppercase;
  letter-spacing:1vw;
}




// Hiding the scrollbar
// for reference >> https://css-tricks.com/custom-scrollbars-in-webkit/

.horizontal-child {
  &::-webkit-scrollbar {
    display:none;
  }
  
  &::-webkit-scrollbar-track {
    display:none;
  }
  
  &::-webkit-scrollbar-thumb {
    display:none;  
  }
  
  &::-webkit-scrollbar-thumb:window-inactive {
	  display:none; 
  }
}
!

JS
!
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