.spinner {
  aspect-ratio: 1;
  border-radius: 50%;
  background:
    radial-gradient(farthest-side, currentColor 94%, #0000) top/3px 3px
      no-repeat,
    conic-gradient(#0000 30%, currentColor);
  -webkit-mask: radial-gradient(farthest-side, #0000 calc(100% - 3px), #000 0);
  mask: radial-gradient(farthest-side, #0000 calc(100% - 3px), #000 0);
  animation: spin 1s infinite linear;
}

@keyframes spin {
  100% {
    transform: rotate(1turn);
  }
}