html {
  position: relative;
  background: var(--bg, #f6c70c);
}

html::before {
  content: "";
  position: fixed;
  inset: -60vh -60vw;
  z-index: 0;
  pointer-events: none;
  background-image: url("../img/oden_bg.png");
  background-repeat: repeat;
  background-size: 178.5px 225.5px;
  mix-blend-mode: multiply;
  opacity: 0.1;
  transform: translate3d(-178.5px, -225.5px, 0);
  animation: chikuwaBgScroll 22s linear infinite;
  will-change: transform;
}

body {
  position: relative;
  z-index: 1;
  isolation: isolate;
  background: transparent;
}

@keyframes chikuwaBgScroll {
  from {
    transform: translate3d(-178.5px, -225.5px, 0);
  }
  to {
    transform: translate3d(178.5px, 225.5px, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  html::before {
    animation: none;
    transform: translate3d(0, 0, 0);
  }
}