.loader {
  border: 4px solid #a8a6a1; /* Light grey */
  border-top: 4px solid #000000; /* Blue */
  border-radius: 50%;
  width: 20px;
  height: 20px;
  animation: spin 1s linear infinite;
  margin-left: auto;
  margin-right: auto;
}

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