<div class="circles">
    <div class="circle1"></div>
    <div class="circle2"></div>
    <div class="circle3"></div>
    <div class="circle4"></div>
    <div class="circle5"></div>
    <div class="circle6"></div>
    <div class="circle7"></div>
    <div class="circle8"></div>
    <div class="circle9"></div>
    <div class="circle10"></div>
    <div class="circle11"></div>
    <div class="circle12"></div>
    <div class="circle13"></div>
    <div class="circle14"></div>
    <div class="circle15"></div>
</div>

body {
  overflow-y:hidden;
  background:black;
  height:100vh;
  display:flex;
}     
.circles {
  width:300px;
  height:300px;
  position:relative;
  margin:auto;
}
.circles > * {
  background-color:transparent;
  box-sizing:border-box;
  border:5px solid powderblue;
  border-top: 0 solid transparent;
  border-left: 0 solid transparent;
  border-radius: 50%;
  position:absolute;
  animation: spin 4s infinite linear alternate;
}
      
.circle1 {
  width: 300px; height: 300px;
  animation-delay:-5s;    
  border-color:rgba(163,207,213, 1);
}
.circle2 {
  width: 280px; height: 280px;
  top:10px;left:10px;
  animation-delay:-4.9s;
  border-color:rgba(163,207,213, .95);
}
.circle3 {
  width: 260px; height: 260px;
  top:20px;left:20px;
  animation-delay:-4.8s;
  border-color:rgba(163,207,213, .9);
}
.circle4 {
  width: 240px; height: 240px;
  top:30px;left:30px;
  animation-delay:-4.7s;
  border-color:rgba(163,207,213, .85);
}
.circle5 {
  width: 220px; height: 220px;
  top:40px;left:40px;
  animation-delay:-4.6s;
  border-color:rgba(163,207,213, .8);
}
.circle6 {
  width: 200px; height: 200px;
  top:50px;left:50px;
  animation-delay:-4.5s;
  border-color:rgba(163,207,213, .75);
}
.circle7 {
  width: 180px; height: 180px;
  top:60px;left:60px;
  animation-delay:-4.4s;
  border-color:rgba(163,207,213, .7);
}
.circle8 {
  width: 160px; height: 160px;
  top:70px;left:70px;
  animation-delay:-4.3s;
  border-color:rgba(163,207,213, .65);
}
.circle9 {
  width: 140px; height: 140px;
  top:80px;left:80px;
  animation-delay:-4.2s;
  border-color:rgba(163,207,213, .6);
}
.circle10 {
  width: 120px; height: 120px;
  top:90px;left:90px;
  animation-delay:-4.1s;
  border-color:rgba(163,207,213, .55);
}
.circle11 {
  width: 100px; height: 100px;
  top:100px;left:100px;
  animation-delay:-4s;
  border-color:rgba(163,207,213, .5);
}
.circle12 {
  width: 80px; height: 80px;
  top:110px;left:110px;
  animation-delay:-3.9s;
  border-color:rgba(163,207,213, .45);
}
.circle13 {
  width: 60px; height: 60px;
  top:120px;left:120px;
  animation-delay:-3.8s;
  border-color:rgba(163,207,213, .4);
}
.circle14 {
  width: 40px; height: 40px;
  top:130px;left:130px;
  animation-delay:-3.7s;
  border-color:rgba(163,207,213, .35);
}
.circle15 {
  width: 20px; height: 20px;
  top:140px;left:140px;
  animation-delay:-3.6s;
  border-color:rgba(163,207,213, .3);
}
      
@keyframes spin {
    0% {transform: rotate(0deg);}
    100% {transform: rotate(360deg);};
}