.loader {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: inline-block;
  position: relative;
  border: 3px solid;
  border-color: #FFF #FFF transparent;
  box-sizing: border-box;
  animation: rotation 1s linear infinite;
}
.loader::after {
  content: '';  
  box-sizing: border-box;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
  border: 3px solid;
  border-color: transparent #FF3D00 #FF3D00;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  animation: rotationBack 0.5s linear infinite;
  transform-origin: center center;
}

.loader-carregando {
  width: 4rem;
  height: 4rem;
  border-radius: 50%;
  display: inline-block;
  position: relative;
  border: 5px solid;
  border-color: #FFF #FFF transparent;
  box-sizing: border-box;
  animation: rotation 1s linear infinite;
}
.loader-carregando::after {
  content: '';  
  box-sizing: border-box;
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  bottom: 0;
  margin: auto;
  border: 5px solid;
  border-color: transparent #8732c0 #8732c0;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  animation: rotationBack 0.5s linear infinite;
  transform-origin: center center;
}

@keyframes rotation {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
} 
    
@keyframes rotationBack {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(-360deg);
  }
}