Gerador CSS para Spinner Loader

.spinner {
  width: 24px;
  height: 24px;
  border-radius: 999px;
  border: 2px solid #cbd5e1;
  border-top-color: #2563eb;
  animation: spin 0.3s linear infinite;
}

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