.develux-spinner{
  width: 40px;
  height: 40px;
  border: 4px solid #ccc;
  border-top: 4px solid #333;
  border-radius: 50%;
  animation: develux_spin 1s linear infinite;
  margin: 0 auto;
}
@keyframes develux_spin {
  to { transform: rotate(360deg); }
}