CSS only Spinner Loader

<div class="mainLoaderContainer">
  <span class="loaderSpan span1"></span>
  <span class="loaderSpan span2"></span>
  <span class="loaderSpan span3"></span>
  <span class="loaderSpan span4"></span>
  <span class="loaderSpan span5"></span>
  <span class="loaderSpan span6"></span>
  <span class="loaderSpan span7"></span>
  <span class="loaderSpan span8"></span>
  <span class="loaderSpan span9"></span>
</div>

body {
  margin: 0;
}
.mainLoaderContainer {
  background-color:#000;
  height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;  
}
.loaderSpan {
  position:absolute;
  border-radius:50%;
  animation: rotate 1.4s ease-in-out infinite;
}
.span1 {
  width:50px;
  height:50px;
  border:4px solid #d500f9;
  border-bottom:4px solid transparent;
  border-left:4px solid transparent;
  animation-delay: 50ms;
}
.span2 {
  width:60px;
  height:60px;
  border:4px solid #e91e63;
  border-bottom:4px solid transparent;
  border-left:4px solid transparent;
  animation-delay: 100ms;
}
.span3 {
  width:70px;
  height:70px;
  border:4px solid #26a69a;
  border-bottom:4px solid transparent;
  border-left:4px solid transparent;
  animation-delay: 150ms;
}
.span4 {
  width:80px;
  height:80px;
  border:4px solid #cddc39;
  border-bottom:4px solid transparent;
  border-left:4px solid transparent;
  animation-delay: 200ms;
}
.span5 {
  width:90px;
  height:90px;
  border:4px solid #7cb342;
  border-bottom:4px solid transparent;
  border-left:4px solid transparent;
  animation-delay: 250ms;
}
.span6 {
  width:100px;
  height:100px;
  border:4px solid #ffa726;
  border-bottom:4px solid transparent;
  border-left:4px solid transparent;
  animation-delay: 300ms;
}
.span7 {
  width:110px;
  height:110px;
  border:4px solid #ff8a65;
  border-bottom:4px solid transparent;
  border-left:4px solid transparent;
  animation-delay: 350ms;
}
.span8 {
  width:120px;
  height:120px;
  border:4px solid #ef5350;
  border-bottom:4px solid transparent;
  border-left:4px solid transparent;
  animation-delay: 400ms;
}
.span9 {
  width:130px;
  height:130px;
  border:4px solid #4a148c;
  border-bottom:4px solid transparent;
  border-left:4px solid transparent;
  animation-delay: 450ms;
}
@keyframes rotate {
  0% {
    transform: rotate(-45deg);
  }
  90%, 100% {
     transform: rotate(315deg);
  }
}