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body {
  background: #000;
}
.particle-wrapper{
  display: block;
  width: 100%;
  height: 100%;
  position: relative;
}
.particle {
    position: absolute;
    border-radius: 50%;
    background: #fff;
    border:3px solid #000;
  svg{
    .st0{
    fill:none;
    stroke:#fff;
    }
    path{
      stroke-opacity:1;
      stroke:#000;
      fill:#000;
      stroke-width:.5;
    }
  }
}

@for $i from 1 through 20 {
    @keyframes particle-animation-#{$i} {
        100% {
            transform: translate3d((random(90) * 1vw), (random(90) * 1vh), (random(100) * 1px));
        }
    }
    
    .particle:nth-child(#{$i}){
        animation: particle-animation-#{$i} 50s infinite;
        animation-direction:alternate;
        $size: random(80) + 20 + px;
        height: $size;
        width: $size;
        animation-delay: -$i * .2s;
        transform: translate3d((random(120) * 1vw), (random(120) * 1vh), (random(100) * 1px));
    }
}
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External CSS

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