*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: #1a1a2e;
}

canvas {
  display: block;
  /* Pixel-perfect scaling — no blurry edges */
  image-rendering: pixelated;
  image-rendering: crisp-edges;
}