.loader {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 8px solid transparent;
  border-top: 8px solid #3498db;
  border-right: 8px solid #e74c3c;
  border-bottom: 8px solid #2ecc71;
  border-left: 8px solid #f39c12;

  animation:
    rotate-color 2s linear infinite,
    morph 2s ease-in-out infinite;
}

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

@keyframes morph {
  0%,
  100% {
    border-radius: 50%;
    width: 80px;
    height: 80px;
  }
  50% {
    border-radius: 10%;
    width: 100px;
    height: 100px;
  }
}