/* An absolute backdrop: it never changes document flow or the animated arrow. */
#intro-universe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 82vh;
  z-index: 1;
  overflow: hidden;
  pointer-events: none;
}
#intro-universe canvas {
  display: block;
  width: 100%;
  height: 100%;
}