.loader {
  margin-top: 80px;
  margin-left: auto;
  margin-right: auto;
  border: 16px solid #f3f3f3; /* Light grey */
  border-top: 16px solid #3498db; /* Blue */
  border-radius: 50%;
  width: 150px;
  height: 100px;
  animation: spin 2s linear infinite;

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