* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
html, body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #0d1117;
  touch-action: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}
canvas {
  display: block;
  width: 100%;
  height: 100%;
}