SOURCE

let particles = []
let microparticles = []

const c1 = createCanvas({width: $(window).width(), height: $(window).height()})

const tela   = c1.canvas;
const canvas = c1.context;

// $("body").append(tela);
$("body").append(c1.canvas);


class Particle{
  constructor(canvas){
    this.random = Math.random()
    this.random1 = Math.random()
    this.random2 = Math.random()
    this.progress = 0;
    this.canvas = canvas;
    this.life = 1000 + (Math.random()*3000)

    this.x = ($(window).width()/2)  + (Math.random()*20 - Math.random()*20)
    this.y = $(window).height()
    this.s = 2 + Math.random();
    this.w = $(window).width()
    this.h = $(window).height()
    this.direction = this.random > .5 ? -1 : 1
    this.radius = 1 + (3 * this.random)
    this.color  = "#ff417d"

    this.ID = setInterval(function(){
      microparticles.push(new microParticle(c1.context,{
        x: this.x,
        y: this.y
      }))
    }.bind(this), this.random*20)

    setTimeout(function(){
      clearInterval(this.ID)
    }.bind(this), this.life )
  }

  render(){
    this.canvas.beginPath();
    this.canvas.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
    // this.canvas.lineWidth = 2;
    this.canvas.shadowOffsetX = 0;
    this.canvas.shadowOffsetY = 0;
    // this.canvas.shadowBlur = 6;
    this.canvas.shadowColor = "#000000";
    this.canvas.fillStyle = this.color;
    this.canvas.fill();
    this.canvas.closePath();
  }

  move(){
    this.x -= (this.direction) * Math.sin(this.progress/((this.random1*430))) * this.s;
    this.y -= Math.cos(this.progress/this.h) * this.s;

    if(this.x < 0 || this.x > this.w - this.radius){
      clearInterval(this.ID)
      return false
    }

    if(this.y < 0){
      clearInterval(this.ID)
      return false
    }
    this.render()
    this.progress++
    return true
  }
}

class microParticle{
  constructor(canvas, options){
    this.random = Math.random()
    this.random1 = Math.random()
    this.random2 = Math.random()
    this.progress = 0;
    this.canvas = canvas;

    this.x = options.x
    this.y = options.y
    this.s = 2 + Math.random() * 3;
    this.w = $(window).width()
    this.h = $(window).height()
    this.radius = 1 + this.random*0.5
    this.color  = "#4EFCFE";//this.random > .5 ? "#a9722c" : "#FFFED7"
  }

  render(){
    this.canvas.beginPath();
    this.canvas.arc(this.x, this.y, this.radius, 0, 2 * Math.PI);
    this.canvas.lineWidth = 2;
    this.canvas.fillStyle = this.color;
    this.canvas.fill();
    this.canvas.closePath();
  }

  move(){
    this.x -= Math.sin(this.progress/(100/(this.random1 - this.random2*10))) * this.s;
    this.y += Math.cos(this.progress/this.h) * this.s;

    if(this.x < 0 || this.x > this.w - this.radius){
      return false
    }

    if(this.y > this.h){
      return false
    }
    this.render()
    this.progress++
    return true
  }
}

var random_life = 1000


setInterval(
  function(){
    particles.push(new Particle(canvas))
    random_life = 2000 * Math.random()
  }.bind(this)
, random_life)

function clear(){
  let grd = canvas.createRadialGradient(tela.width/2, tela.height/2, 0, tela.width/2, tela.height/2, tela.width);
        grd.addColorStop(0,"rgba(82,42,114,1)");
        grd.addColorStop(1,"rgba(26,14,4,0)");
    // Fill with gradient
    canvas.globalAlpha=0.16;
    canvas.fillStyle=grd;
    canvas.fillRect(0, 0, tela.width, tela.height);
}

function blur(ctx,canvas, amt) {
  // ctx.filter = `blur(${amt}px)`
  // ctx.drawImage(canvas, 0, 0)
  // ctx.filter = 'none'
}

function update(){
  clear();
  particles = particles.filter(function(p) {
    return p.move()
  })
  microparticles = microparticles.filter(function(mp) {
    return mp.move()
  })
  requestAnimationFrame(update.bind(this))
}


function createCanvas(properties){
  let canvas = document.createElement('canvas');
      canvas.width = properties.width;
      canvas.height = properties.height;
  let context = canvas.getContext('2d');
  return {
    canvas: canvas,
    context: context
  }
}
update()

<a class="codepen-promotion" target="_blank" href="https://codepen.io/collection/nZpPbz/" title="The Most Hearted of 2017">
                    <img class="codepen-promotion__image" src="https://www.plasm.it/images/codepen-promotion.png" alt="">
                  </a>

<div class="title">
    <h3>PLASM.it - 2018</h3>
    <h1>STARDUST</h1>
    <h3>A N O T H E R <strong>C O D E P E N</strong></h3>
  </div>
  <div class="more-pens">
    <a target="_blank" href="https://codepen.io/plasm/pen/LeBdEO" class="white-mode">VIEW MY LAST PEN</a>
    <a target="_blank" href="http://codepen.io/collection/nZpPbz/" class="white-mode">VIEW OTHER PARTICLES</a>
  </div>

body
  padding: 0
  margin: 0

@import url('https://fonts.googleapis.com/css?family=Montserrat:200,300,400,600')
.more-pens
  position: fixed
  left: 20px
  bottom: 20px
  z-index: 10
  font-family: "Montserrat"
  font-size: 12px

a.white-mode, a.white-mode:link, a.white-mode:visited, a.white-mode:active
  font-family: "Montserrat"
  font-size: 12px
  text-decoration: none
  background: #212121
  padding: 4px 8px
  color: #f7f7f7
  &:hover
    background: #edf3f8
    color: #212121

body
  margin: 0
  padding: 0
  overflow: hidden
  width: 100%
  height: 100%
  background: #000000


.title
  z-index: 10
  position: absolute
  left: 50%
  top: 50%
  transform: translateX(-50%) translateY(-50%)
  font-family: "Montserrat"
  text-align: center
  width: 100%

  h1
    position: relative
    color: #FFF
    font-weight: 100
    font-size: 90px
    padding: 0
    margin: 0
    line-height: 1
    text-shadow: 0 0 10px #ff006c, 0 0 20px #ff006c, 0 0 30px #ff006c, 0 0 40px #ff417d, 0 0 70px #ff417d, 0 0 80px #ff417d, 0 0 100px #ff417d, 0 0 150px #ff417d

    span
      font-weight: 600
      padding: 0
      margin: 0
      color: #FFFFFF

  h3
    font-weight: 200
    font-size: 20px
    padding: 0
    margin: 0
    line-height: 1
    color: #FFFFFF
    letter-spacing: 2px


.codepen-promotion:active, .codepen-promotion:hover, .codepen-promotion:link, .codepen-promotion:visited
  position: absolute
  display: block
  width: 200px
  z-index: 111
  right: 40px
  bottom: 40px
  
.codepen-promotion__image
  width: 100%