<div>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
  <b></b>
</div>

body {
  background-color: hsl(226, 62%, 10%);
  display: grid;
  grid-template-columns: 1fr;
  min-height: 100dvh;
  overflow-x: hidden;
}
div {
  aspect-ratio: 1 / 1;
  box-sizing: border-box;
  container-type: inline-size;
  display: grid;
  grid-template-columns: 1fr;
  padding: 2em;
  place-content: center;
  translate: -.5em 0;
  width: 100%;
}
b {
  animation: animate 8s linear 0s infinite alternate;
  background: hsla(var(--deg), 80%, 50%, .5);
  border-radius: 40cqi;
  box-shadow: 0 0 0 .125cqi hsla(var(--deg), 80%, 90%, .5) inset;
  grid-column: 1 / -1;
  grid-row: 1 / -1;
  height: 40cqi;
  mix-blend-mode: screen;
  rotate: calc(45deg + var(--deg));
  transform-origin: calc(100% + .5em) 50%;
  width: 50%;
}
b:nth-of-type(1) { --deg: 20deg; }
b:nth-of-type(2) { --deg: 40deg; }
b:nth-of-type(3) { --deg: 60deg; }
b:nth-of-type(4) { --deg: 80deg; }
b:nth-of-type(5) { --deg: 100deg; }
b:nth-of-type(6) { --deg: 120deg; }
b:nth-of-type(7) { --deg: 140deg; }
b:nth-of-type(8) { --deg: 160deg; }
b:nth-of-type(9) { --deg: 180deg; }
b:nth-of-type(10) { --deg: 200deg; }
b:nth-of-type(11) { --deg: 220deg; }
b:nth-of-type(12) { --deg: 240deg; }
b:nth-of-type(13) { --deg: 260deg; }
b:nth-of-type(14) { --deg: 280deg; }
b:nth-of-type(15) { --deg: 300deg; }
b:nth-of-type(16) { --deg: 320deg; }
b:nth-of-type(17) { --deg: 340deg; }
b:nth-of-type(18) { --deg: 360deg; }

@keyframes animate {
  100% {
    border-radius: 50cqi 5cqi;
  }
}