canvas {
  position: fixed;
  inset: 0;
}

/* subtle atmospheric depth */
body::before {
  content: "";
  position: fixed;
  inset: 0;

  background:
    radial-gradient(circle at 50% 50%, rgba(56,207,178,0.06), transparent 60%),
    radial-gradient(circle at 20% 80%, rgba(98,217,245,0.05), transparent 70%);

  pointer-events: none;
}