<div class="parallax sprite">

  <div class="parallax__layer parallax__layer--bg sprite"></div>

  <div class="parallax__carousel">
    <div class="parallax__carousel__cell sprite"></div>
    <div class="parallax__carousel__cell sprite"></div>
    <div class="parallax__carousel__cell sprite"></div>
    <div class="parallax__carousel__cell sprite"></div>
    <div class="parallax__carousel__cell sprite"></div>
  </div>

  <div class="parallax__layer parallax__layer--fg sprite"></div>

</div>

<p class="tagline"><a href="https://flickity.metafizzy.co">Made with Flickity</a></p>

* { box-sizing: border-box; }

body {
  background: black;
  font-family: sans-serif;
}

/* ---- parallax ---- */

.sprite {
  background-image: url('https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/yoshis-island-parallax-sprite.png');
  background-repeat: no-repeat;
}

.parallax {
  width: 512px;
  position: relative;
  overflow-x: hidden;
  padding-bottom: 40px;
  background-position: 0 -1344px;
  margin: 40px auto 20px;
}

.parallax__carousel {

}

.parallax__carousel__cell {
  width: 512px;
  height: 448px;
}

.parallax__carousel__cell:nth-child(1) { background-position: -0px -448px; }
.parallax__carousel__cell:nth-child(2) { background-position: -512px -448px; }
.parallax__carousel__cell:nth-child(3) { background-position: -1024px -448px; }
.parallax__carousel__cell:nth-child(4) { background-position: -1536px -448px; }
.parallax__carousel__cell:nth-child(5) { background-position: -2048px -448px; }

.parallax__layer {
  position: absolute;
  height: 448px;
  left: 0;
  top: 0;
}

.parallax__layer--bg {
  width: 2224px;
}

.parallax__layer--fg {
  pointer-events: none;
  width: 5200px;
  background-position: 0 -896px;
}

.flickity-prev-next-button { z-index: 2; }

.flickity-page-dots {
/*  bottom: 10px;*/
  z-index: 2;
}

.flickity-page-dots .dot {
  background: white;
}

.tagline {
  font-size: 20px;
  text-align: center;
  margin: 0 0 20px;
}

.tagline a {
  color: #666;
  text-decoration: none;
}

.tagline a:hover { color: #8C8; }

var flkty = new Flickity('.parallax__carousel');

var paraBG = document.querySelector('.parallax__layer--bg');
var paraFG = document.querySelector('.parallax__layer--fg');
var cellRatio = 1;
var bgRatio = 0.75;
var fgRatio = 2;

flkty.on( 'scroll', function( progress ) {
  paraBG.style.left = ( 0.5 - ( 0.5 + progress * 4 ) * cellRatio * bgRatio ) * 100 + '%';
  paraFG.style.left = ( 0.5 - ( 0.5 + progress * 4 ) * cellRatio * fgRatio ) * 100 + '%';
});

flkty.reposition();