* {
  box-sizing: border-box;
}

html,
body {
  width: 100%;
  height: 100%;
  margin: 0;
  overflow: hidden;
  background: #ffffff;
  color: #000000;
  font-family: Arial, Helvetica, sans-serif;
}

canvas {
  display: block;
  width: 100vw;
  height: 100vh;
  touch-action: none;
  cursor: crosshair;
}