<ul class="c">
  <li></li>
  <li></li>
  <li></li>
  <li></li>
  <li></li>
</ul>

$colors: 
  #489D8A
  #324650
  #D34B4C
  #E8A961;
$size: 2em; /*change this to resize*/

@function scale($i){
  @return 1em * $i;
}

.c{
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  width: 5em;
  width: scale(5);
  li{
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    top: 0;
    margin: auto;
    border-radius: 50%;
    box-sizing: border-box;
    display: flex;
    justify-content: center;
    align-items: center;
    transform-origin: center center;
    animation: anim 1s ease-in-out infinite;
    will-change: transform, filter;
    &:nth-child(1){
      width: scale(1);
      height: scale(1);
      &:after{
        content:'';
        display: block;
        font-size: 25%;
        width: 1em;
        height: 1em;
        border-radius: 50%;
        box-shadow: 
          scale(1) 0 0 rgba(nth($colors, 1), .2),
          -(scale(1)) 0 0 rgba(nth($colors, 2), .2),
          0 scale(1) 0 rgba(nth($colors, 3), .2),
          0 (-(scale(1))) 0 rgba(nth($colors, 4), .2);
      }
    }
    &:nth-child(2){
      animation-delay: .1s;
      width: scale(2);
      height: scale(2);
      &:after{
        content:'';
        display: block;
        font-size: 50%;
        width: 1em;
        height: 1em;
        border-radius: 50%;
        box-shadow: 
          scale(1.5) 0 0 rgba(nth($colors, 1), .4),
          -(scale(1.5)) 0 0 rgba(nth($colors, 2), .4),
          0 scale(1.5) 0 rgba(nth($colors, 3), .4),
          0 (-(scale(1.5))) 0 rgba(nth($colors, 4), .4); 
      }
    }
    &:nth-child(3){
      animation-delay: .15s;
      width: scale(3);
      height: scale(3);
      &:after{
        content:'';
        display: block;
        font-size: 75%;
        width: 1em;
        height: 1em;
        border-radius: 50%;
        box-shadow: 
          scale(2) 0 0 rgba(nth($colors, 1), .6),
          -(scale(2)) 0 0 rgba(nth($colors, 2), .6),
          0 scale(2) 0 rgba(nth($colors, 3), .6),
          0 (-(scale(2))) 0 rgba(nth($colors, 4), .6);
      }
    }
    &:nth-child(4){
      animation-delay: .2s;
      width: scale(4);
      height: scale(4);
      &:after{
        content:'';
        display: block;
        font-size: 100%;
        width: 1em;
        height: 1em;
        border-radius: 50%;
        box-shadow: 
          scale(2.5) 0 0 rgba(nth($colors, 1), .8),
          -(scale(2.5)) 0 0 rgba(nth($colors, 2), .8),
          0 scale(2.5) 0 rgba(nth($colors, 3), .8),
          0 (-(scale(2.5))) 0 rgba(nth($colors, 4), .8);
      }
    }
    &:nth-child(5){
      animation-delay: .25s;
      width: scale(5);
      height: scale(5);
      &:after{
        content:'';
        display: block;
        font-size: 125%;
        width: 1em;
        height: 1em;
        border-radius: 50%;
        box-shadow: 
          scale(3) 0 0 nth($colors, 1),
          -(scale(3)) 0 0 nth($colors, 2),
          0 scale(3) 0 nth($colors, 3),
          0 (-(scale(3))) 0 nth($colors, 4);
      }
    }
  }
}
@keyframes anim {
  50%{
    filter: blur(2px);
  }
  90%, 100%{ 
    transform: rotate(1turn);
    filter: blur(0);
  }
}


html{ font-size: 10px; height: 100%;}
body{
  background: #fcfcfc;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: $size;
}