/* HTML: <div class="loader"></div> */
.loader {
  width: 35px;
  aspect-ratio: 1;
  --_g: no-repeat radial-gradient(farthest-side, #000 94%, #0000);
  background: var(--_g) 0 0, var(--_g) 100% 0, var(--_g) 100% 100%,
    var(--_g) 0 100%;
  background-size: 40% 40%;
  animation: l38 0.5s infinite;
}
@keyframes l38 {
  100% {
    background-position: 100% 0, 100% 100%, 0 100%, 0 0;
  }
}