*,
*::after,
*::before {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue';
  -webkit-tap-highlight-color: transparent;
}

html {
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: white transparent;
}

body {
  height: 100dvh;
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  place-content: center;
  background-image: radial-gradient(circle closest-corner, black, #333, black);
}

.container {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  position: relative;
  perspective: 10000px;
  transform-style: preserve-3d;
  animation: rotar 11s linear infinite alternate both;

  .aro {
    width: 100%;
    height: 100%;
    border: 3px solid #fff;
    border-radius: inherit;
    position: absolute;
    transform: rotateX(90deg) rotateY(calc(360deg / 9 * var(--r)));
  }
}

@keyframes rotar {
  0% {
    transform: rotateX(30deg) rotateY(30deg) rotateZ(0deg);
  }
  100% {
    transform: rotateX(30deg) rotateY(30deg) rotateZ(360deg);
  }
}