#visualizer-canvas {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(ellipse at center, #000 0%, #111 100%);
  opacity: 0.6;
  filter: blur(1px) brightness(1.1);
  mix-blend-mode: screen;
}