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

html, body {
  width: 100%;
  height: 100%;
  background-color: #0b1020;
  overflow: hidden;
  color: #fff;
  font-family: ui-monospace, "SF Mono", Consolas, monospace;
}

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

canvas {
  display: block;
  background: #0b1020;
  box-shadow: 0 0 24px rgba(0, 0, 0, 0.85);
  cursor: crosshair;
}