div.circle-wrap
  - for (var x =1; x <= 12; x++)
    div.row
      - for (var y = 1; y <= 12; y++)
        div.circle
View Compiled
@mixin center {
  display: flex;
  align-items: center;
  justify-content: center;
}
body {
  @include center;
  height: 100vh;
  background-image: linear-gradient(45deg, #00DBDE 0%, #FC00FF 100%);
}
.row {
  display: flex;
  .circle {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    margin: 5px 10px;
    background: #fff;
    transform-origin: top center;
    animation: spin 1s linear infinite;
  }
}
@keyframes spin {
    0% {transform: scale(1.1) rotate(0deg)}
    50% {transform: scale(0.1) rotate(180deg)}
    100% {transform: scale(1.1) rotate(360deg)}
  }
  // .row:nth-child(1) .circle {
  //   animation-delay: 100ms
  // }
  // .row:nth-child(2) .circle {
  //   animation-delay: 200ms
  // }
  // .row:nth-child(3) .circle {
  //   animation-delay: 300ms
  // }
  // .row:nth-child(4) .circle {
  //   animation-delay: 400ms
  // }
  @for $i from 1 through 12 {
    .row:nth-child(#{$i}) .circle {
      animation-delay: 100ms * $i
    }
  }






View Compiled

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