blockchain-society
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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <title>Scroll Abberations</title>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <style>
    body {
      display: flex;
      flex-direction: row;
      flex-wrap: wrap;
    }

    .abberation {
      position: relative;
      flex: 1 0 30%;
      margin: 20px;
    }

    .abberation img {
      max-width: 100%;
    }

    .abberation img:first-child {
      position: absolute;
    }

    .abberation:nth-child(n+4) img {
      max-width: 50%;
    }

    .abberation:nth-child(n+7) img {
      max-width: 20%;
    }
  </style>
</head>
<body>
  <section class="abberation">
    <img src="autotrace.svg">
    <img src="potrace.svg">
  </section>
  <section class="abberation">
    <img src="potrace.svg">
    <img src="potrace.svg">
  </section>
  <section class="abberation">
    <img src="autotrace.svg">
    <img src="autotrace.svg">
  </section>
  <section class="abberation">
    <img src="autotrace.svg">
    <img src="potrace.svg">
  </section>
  <section class="abberation">
    <img src="potrace.svg">
    <img src="potrace.svg">
  </section>
  <section class="abberation">
    <img src="autotrace.svg">
    <img src="autotrace.svg">
  </section>
  <section class="abberation">
    <img src="autotrace.svg">
    <img src="potrace.svg">
  </section>
  <section class="abberation">
    <img src="potrace.svg">
    <img src="potrace.svg">
  </section>
  <section class="abberation">
    <img src="autotrace.svg">
    <img src="autotrace.svg">
  </section>
  <script>
    document.addEventListener('wheel', function (e) {
      var max = 2, speed = 0.1;

      document.querySelectorAll('.abberation img:first-child').forEach(function (img) {
        var rotation = ('rotation' in img.dataset) ? parseFloat(img.dataset.rotation) : 0;
        var direction = ('direction' in img.dataset) ? parseInt(img.dataset.direction) : 1;
        var delta = (Math.random() * speed) * direction;
        
        rotation = Math.max(-max, Math.min(rotation + delta, max));

        if (rotation === max) {
          direction = -1;
        } else if (rotation === -max) {
          direction = 1;
        }

        img.style.transform = 'rotate('+rotation.toString(10)+'deg)';
        img.dataset.rotation = rotation;
        img.dataset.direction = direction;
      });
    });
  </script>
</body>
</html>