html, body {
  margin: 0;
  padding: 0;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background-color: #000000;
  user-select: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 16:9 Aspect-Ratio Preserved Fullscreen Canvas */
canvas {
  width: 100vw !important;
  height: 100vh !important;
  max-width: 100vw;
  max-height: 100vh;
  aspect-ratio: 16 / 9 !important;
  object-fit: contain !important;
  display: block;
}

#bgCanvas {
  z-index: 1;
}

#fgCanvas {
  z-index: 2;
  mix-blend-mode: screen;
}