body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAADUlEQVQIW2P4z8DwHwAE/wJ/lYdRswAAAABJRU5ErkJggg==");
  opacity: 0.15;
  mix-blend-mode: overlay;
  z-index: 9999;
}