/* HTML: <div class="loader"></div> */
.loader {
  width: 5vw;

  aspect-ratio: 1.154;
  --_g: no-repeat radial-gradient(farthest-side, #000 90%, #0000);
  background:
    var(--_g) 50% 0,
    var(--_g) 0 100%,
    var(--_g) 100% 100%;
  background-size: 35% calc(35%*1.154);
  animation: l16 1s infinite;
}

@keyframes l16 {

  50%,
  100% {
    background-position: 100% 100%, 50% 0, 0 100%
  }
}

.loader.hidden {
  display: none;
}