.overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: 2;
  pointer-events: none;
  background: repeating-radial-gradient(circle, rgba(255,255,255,0.07) 1px, transparent 2px, transparent 20px);
}