.circle {
  position: absolute;
  
  border: 3px solid transparent;
  border-top-color: var(--highlight);
  border-radius: 50%;
  
  animation: rotate linear infinite;
}
.circle.one {
  height: 50px;
  width: 50px;
  left: 50px;
  top: 50px;
  animation-duration: 0.85s;
}
.circle.two {
  height: 75px;
  width: 75px;
  top: 38px;
  left: 38px;
  animation-duration: 0.95s;
}

.circle.three {
  height: 100px;
  width: 100px;
  top: 25px;
  left: 25px;
  animation-duration: 1.05s
}

@keyframes rotate {
  from{
    transform: rotateZ(360deg);
  }
  to{
    transform: rotateZ(0deg);
  }
}
.loader {
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -90px 0 0 -90px;
}