css spiner

.spinner {
  /* ... */
  opacity: 0;
  animation:
    fadeIn 500ms 100ms forwards,
    rotate 1s linear infinite;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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