.spinner {
  border: 5px solid #f3f3f3;
  border-top: 5px solid #0092b8;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 20px auto;
}

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