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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.

            
              <main class="">
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div></div>
  <div class="primary"></div>
</main>

<form>
  <button type="button" class="active" data-step="0">1</button>
  <button type="button" data-step="1">2</button>
  <button type="button" data-step="2">3</button>
</form>
<p class="step1">Add six frames. For each frame overlay a repeating gradient of 1px transparent and 5px white. Offset this gradient by 1px for each frame.</p>
<p class="step2">Apply a mix-blend-mode of multiply to each frame, letting the underlying frames to show instead of the white blocks from the gradient.</p>
<p class="step3">Add a cover on top that is 1px transparent and 5px black. Translate it 5px infinitely. The underlying frames will show through one at a time.</p>
            
          
!
            
              :root {
  --pixel: 1px;
  --cover: #212123;
  --duration: 1000ms;
  --covered: calc(var(--pixel) * 5); /*6 frames, 5 covered at a time */
  --space: white; /* will cause transparency when mix blend mode multiply */
  --w: 100vw;
  --h: 100vh;
  
  --depth-base: 0px;
  --direction: alternate;
  
  --blend: none;
}
main *, main *::after {
  opacity: 0;
}
main div {
  --offset: calc(var(--pixel) * 1);
  --background-image: radial-gradient(circle, cyan 0%, cyan);
  --background-cover-yes: linear-gradient(to right, transparent 0, transparent calc(var(--pixel)), var(--space) var(--pixel), var(--space) calc(var(--covered)));
  --background-cover-no: linear-gradient(to right, transparent, transparent);
  --background-cover: var(--background-cover-no);
  
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  overflow: hidden;
  background-color: #16161c;
  background-image: var(--background-cover),
    var(--background-image);
  mix-blend-mode: var(--blend);
  
  background-position: calc(var(--offset) - calc(var(--pixel) * 1)) 0, center center;
  background-size: calc(var(--pixel) * 6) 100%, cover;
  background-repeat: repeat, no-repeat;
  transition: background 750ms ease-in-out;
  
  filter: saturate(200%);
}

main div:nth-of-type(2) {
  --offset: calc(var(--pixel) * 2);
  --background-image: radial-gradient(circle, hotpink 0%, cyan 20%);
}
main div:nth-of-type(3) {
  --offset: calc(var(--pixel) * 3);
  --background-image: radial-gradient(circle, hotpink 20%, cyan 40%);
}
main div:nth-of-type(4) {
  --offset: calc(var(--pixel) * 4);
  --background-image: radial-gradient(circle, hotpink 40%, cyan 60%);
}
main div:nth-of-type(5) {
  --offset: calc(var(--pixel) * 5);
  --background-image: radial-gradient(circle, hotpink 60%, cyan 75%);
}
main div:nth-of-type(6) {
  --offset: calc(var(--pixel) * 6);
  --background-image: radial-gradient(circle, hotpink 80%, cyan);
}

/*want to try using your own frames? insert them here, with either a gradient or an image with url() */
/**/
main div:nth-of-type(1) {
  --background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/61811/h1.jpg);
}
main div:nth-of-type(2) {
  --background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/61811/h2.jpg);
}
main div:nth-of-type(3) {
  --background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/61811/h3.jpg);
}
main div:nth-of-type(4) {
  --background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/61811/h4.jpg);
}
main div:nth-of-type(5) {
  --background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/61811/h5.jpg);
}
main div:nth-of-type(6) {
  --background-image: url(https://s3-us-west-2.amazonaws.com/s.cdpn.io/61811/h6.jpg);
}
/**/



/*the sliding cover that triggers the motion illusion */
.primary::after {
  content: '';
  position: absolute;
  top: 0;
  right: calc(var(--pixel) * -12);
  bottom: 0;
  left: calc(var(--pixel) * -12);
  background: linear-gradient(to right, transparent 0px, transparent calc(var(--pixel) * 1), var(--cover) calc(var(--pixel) * 1), var(--cover) calc(var(--pixel) * 6));
  will-change: transform, opacity;
  transition: opacity var(--duration) linear;
  mix-blend-mode: normal;
  opacity: var(--show, 0);
  transform: translateX(var(--slide-amount, 0));
  background-size: calc(var(--pixel) * 6) 100%;
  
  animation: var(--animation, none) var(--duration) infinite var(--direction) linear;
}

@keyframes cover {
  100% {
    transform: translateX(calc(var(--pixel) * 5))
  }
}

main {
  width: var(--w);
  height: var(--h);
  position: relative;
  transition: transform var(--duration) ease-in-out;
  background: white;
  transform: scale(1);
}
*, *::after {
  box-sizing: border-box;
}










body {
  width: 100%;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background: hsl(203, 50%, 4%);
  margin: 0;
  overflow: hidden;
  touch-action: none;
  
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif
}
form {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  padding: .2rem 1rem;
  text-align: center;
  
  background: rgba(245,245,255,.86);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  --form-color-alpha: rgba(150, 250, 255, .1);
  overflow: auto;
}
form div {
  padding: .5rem .5rem;
  font-size: 12px;
  transform: translateX(1rem);
}
form label {
  transform: translateX(-1.5rem)
}
p {
  position: absolute;
  line-height: 1.334;
  bottom: 0;
  left:0;
  right:0;
  
  padding: .5rem 1rem;
  text-align: center;
  
  background: rgba(245,245,255,1);
  display: flex;
  align-items: center;
  justify-content: center;
  
  opacity: 0;
}
code {
  display: inline;
  font-family: monospace;
}


button {
  appearance: none;
  border: 0;
  border-radius: 50%;
  font-size: 1rem;
  margin: .5rem 1rem;
  width: 2rem;
  height: 2rem;
  background-color: hsl(193, 50%, 90%);
  transition: background-color 350ms ease-in-out;
}
button.active {
  background-color: hsl(193, 50%, 50%);
  color: #fafaff;
}
            
          
!
            
              var frames = Array.from(document.querySelectorAll('main div'));
var explanations = Array.from(document.querySelectorAll('p[class*=step]'));
var steps = document.querySelectorAll('button');
var duration = 1000;

buildFrames();

function buildFrames(finish) {
  document.documentElement.style.setProperty('--show', 0);
  changeExplanation(0);
  var dur = finish === true ? 0 : duration;
  for (let i = 0, l = frames.length; i < l; ++i) {
    let frame = frames[i];
    var framer = frame.animate({opacity: [0,1]}, {
      duration: dur,
      fill: 'both',
      delay: dur * 2 * i
    });
    framer.onfinish = function() {
      var masker = frame.animate({backgroundImage: ['var(--background-cover-no),var(--background-image)','var(--background-cover-yes),var(--background-image)']}, {
        duration: dur,
        fill: 'both',
        delay: 0
      });

      if (i === l-1) {
        masker.onfinish = startBlendModes;
      }
    };
  }
}


function startBlendModes(finish) {
  document.documentElement.style.setProperty('--show', 0);
  changeExplanation(1);
  var dur = finish === true ? 0 : duration;
  for (let i = frames.length - 1, count = 0; i >= 0; --i) {
    let frame = frames[i];
    var framer = frame.animate({mixBlendMode: ['normal','multiply']}, {
      duration: dur * 1.5,
      fill: 'both',
      delay: dur * (count++) * 1.5
    });
    
    if (i === 0) {
      framer.onfinish = startCover;
    }
  }
}

function startCover() {
  document.documentElement.style.setProperty('--show', 1);
  changeExplanation(2);
  
  setTimeout(() => {
    document.documentElement.style.setProperty('--animation', 'cover');
  }, duration * 3)
}

function changeExplanation(index) {
  explanations[index].animate({opacity:[0,1]}, {
    duration: 250,
    fill: 'both'
  });
  document.querySelector('.active').classList.remove('active');
  steps[index].classList.add('active');
}

function clearAnimations() {
  if (document.getAnimations) {
    document.getAnimations().forEach(function(anim) {
      anim.cancel();
    });
  }
}

// for (let i = 0; i < steps.length; ++i) {
//   steps[i].addEventListener('click', changeStep);
// }
function changeStep(e) {
  var index = parseInt(e.currentTarget.getAttribute('data-step'), 10);
  clearAnimations() 
  
  if (index === 0) {
    buildFrames();
  } else if (index === 1) {
    buildFrames(true);
    startBlendModes();
  } else {
    buildFrames(true);
    startBlendModes(true);
    startCover();
  }
}
            
          
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