.loading{
  width: 200px;
  height: 200px;
  box-sizing: border-box;
  border-radius: 50%;
  border-top: 10px solid #e74c4c;
  position: relative;
}


.loading::before, .loading::after{
  content: '';
  width: 200px;
  height: 200px;
  position: absolute;
  left: 0;
  top: -10px;
  box-sizing: border-box;
  border-radius: 50%;
}

.loading::before{
  border-top:10px solid #e67e22;
  transform: rotate(120deg);
}

.loading::after{
  border-top:10px solid #3498db;
  transform: rotate(240deg);
}


@keyframes a1{
  to{
    transform: rotate(360deg);
  }
}

@keyframes a2{
  to{
    transform: rotate(-360deg);
  }
}