.loader {
  width: 100px;
  height: 100px;
  background-color: orange;
  border-radius: 50%;
  box-shadow: -15px -15px 15px #ff6600, 15px -15px 15px #ff9100, 15px 15px 15px #ff5500, -15px 15px 15px #ffa600, -15px 0 15px #ff6600, 15px 0 15px #ffcc00;
  animation: rotate 1s infinite;
  transform: rotate(0) scale(0.8);
}

@keyframes rotate {
  0% {
    transform: rotate(360deg) scale(0.8);
  }

  50% {
    transform: rotate(0) scale(1.2);
  }
}