.spinner {
  width: 32px;
  height: 32px;
  border: 4px solid #f3f3f3;
  border-top: 4px solid #38d9a9;
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin: 2rem auto;
}

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