Skip welcome & menu and move to editor
Welcome to JS Bin
Load cached copy from
 
<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JS Bin</title>
</head>
<body>
<!-- 
 adapted from https://codepen.io/yshlin/pen/ylDEk
 -->
<div class="pyro">
  <div class="before"></div>
  <div class="after"></div>
</div>
</body>
</html>
 
body {
  margin:0;
  padding:0;
  background: black;
  overflow: hidden;
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  top: 0;
}
.pyro > .before, .pyro > .after {
  position: absolute;
  width: 5px;
  height: 5px;
  border-radius: 50%;
}
@keyframes position {
  0%, 19.9% {
    margin-top: 10%;
    margin-left: 40%;
  }
  20%, 39.9% {
    margin-top: 40%;
    margin-left: 30%;
  }
  40%, 59.9% {
    margin-top: 20%;
    margin-left: 70%
  }
  60%, 79.9% {
    margin-top: 30%;
    margin-left: 20%;
  }
  80%, 99.9% {
    margin-top: 30%;
    margin-left: 80%;
  }
}
 
function animate(element, duration, delay, duration2) {
  const particles = 50;
  const height = 500;
  const width = 500;
  const startPos = [];
  const endPos = [];
  const random = n => {
    return Math.floor(Math.random() * n);
  };
  for (let i = 0; i < particles; i++) {
    const theta = random(360);
    const gamma = random(360);
    const r = 0.7 * width;
    const xOffset = Math.floor(r * Math.cos(theta) * Math.cos(gamma));
    const yOffset = Math.floor(r * Math.cos(theta) * Math.sin(gamma));
    const hue = random(360);
    endPos.push(`${xOffset}px ${yOffset}px hsl(${hue},100%,50%)`);
    startPos.push('0 0 #fff');
  }
  element.style.animation =
    `${duration2}s position linear infinite backwards`;
  element.animate(
    [
      { boxShadow:  startPos.join(',') },
      { boxShadow: endPos.join(',') }
    ],
    {
      duration: duration,
      delay: delay,
      easing: 'ease-out',
      fill: 'backwards',
      iterations: Infinity
    });
  element.animate(
    [
      { transform: 'none', opacity: 1 },
      { transform: 'translateY(200px)', opacity: 0 }
    ],
    {
      duration: duration,
      delay: delay,
      easing: 'ease-in',
      fill: 'backwards',
      iterations: Infinity
    });
}
animate(document.querySelector('.before'), 1000, 1250, 5);
animate(document.querySelector('.after'), 1250, 1250, 6.25);
Output

You can jump to the latest bin by adding /latest to your URL

Dismiss x
public
Bin info
anonymouspro
0viewers