* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  background: #04060d;
  overflow: hidden;
  font-family: "Trebuchet MS", Arial, sans-serif;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
}

canvas {
  display: block;
  border-radius: 12px;
  background: #070a16;
  box-shadow:
    0 0 0 2px rgba(120, 160, 255, 0.14),
    0 30px 90px rgba(0, 0, 0, 0.85),
    0 0 160px rgba(90, 120, 255, 0.10);
  touch-action: none;
}