html,
body {
  margin: 0;
  padding: 0;
  background: #111111;
  overflow: hidden;
  width: 100vw;
  height: 100vh;
}
canvas {
  display: block;
  z-index: 5;
}

.background {
  position: absolute;
  z-index: 1;
  top: 0;
  left: 0;
  width: 100vw;
  height: 120vh;
  mix-blend-mode: multiply;
  background: hsla(191, 60%, 89%, 1);

  background: linear-gradient(
    180deg,
    hsla(191, 60%, 89%, 1) 0%,
    hsla(56, 59%, 86%, 1) 50%,
    hsla(25, 85%, 69%, 1) 100%
  );
}