canvas {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 3;
}
#blue-overlay {
 position: absolute;
  top: 0;
  left: 0;
  z-index: 4; /* Ensure it's above the canvas */
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    rgba(0, 36, 102, 0.5) 0%,
    rgba(20, 79, 227, 0.5) 50%,
    rgba(8, 17, 56, 0.5) 100%
  );
  pointer-events: none; /* Allows clicks to pass through to the canvas */
}