Trecho de animação de carregamento CSS

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.loader {
  display: flex;
  justify-content: center;
  align-items: center;
  --color: hsl(0, 0%, 87%);
  --animation: 2s ease-in-out infinite;
}

.loader .circle {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 20px;
  height: 20px;
  border: solid 2px var(--color);
  border-radius: 50%;
  margin: 0 10px;
  background-color: transparent;
  animation: circle-keys var(--animation);
}

.loader .circle .dot {
  position: absolute;
  transform: translate(-50%, -50%);
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background-color: var(--color);
  animation: dot-keys var(--animation);
}

.loader .circle .outline {
  position: absolute;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  animation: outline-keys var(--animation);
}

.circle:nth-child(2) {
  animation-delay: 0.3s;
}

.circle:nth-child(3) {
  animation-delay: 0.6s;
}

.circle:nth-child(4) {
  animation-delay: 0.9s;
}

.circle:nth-child(5) {
  animation-delay: 1.2s;
}

.circle:nth-child(2) .dot {
  animation-delay: 0.3s;
}

.circle:nth-child(3) .dot {
  animation-delay: 0.6s;
}

.circle:nth-child(4) .dot {
  animation-delay: 0.9s;
}

.circle:nth-child(5) .dot {
  animation-delay: 1.2s;
}

.circle:nth-child(1) .outline {
  animation-delay: 0.9s;
}

.circle:nth-child(2) .outline {
  animation-delay: 1.2s;
}

.circle:nth-child(3) .outline {
  animation-delay: 1.5s;
}

.circle:nth-child(4) .outline {
  animation-delay: 1.8s;
}

.circle:nth-child(5) .outline {
  animation-delay: 2.1s;
}

@keyframes circle-keys {
  0% {
    transform: scale(1);
    opacity: 1;
  }

50% {
    transform: scale(1.5);
    opacity: 0.5;
  }

100% {
    transform: scale(1);
    opacity: 1;
  }
}

@keyframes dot-keys {
  0% {
    transform: scale(1);
  }

50% {
    transform: scale(0);
  }

100% {
    transform: scale(1);
  }
}

@keyframes outline-keys {
  0% {
    transform: scale(0);
    outline: solid 20px var(--color);
    outline-offset: 0;
    opacity: 1;
  }

100% {
    transform: scale(1);
    outline: solid 0 transparent;
    outline-offset: 20px;
    opacity: 0;
  }
}
                                
body{
     display:flex;
     justify-content:center;
     align-items:center;
     min-height:100vh;
background-color:#111;
 }

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