html, body {
  width: 100%;
  height: 100%;
  margin: 0px;
  overflow: hidden;
}
html:hover span, body:hover span {
  display: none;
}

canvas {
  cursor: crosshair;
}

span {
  font-family: 'Georgia', cursive;
  font-size: 40px;
  position: fixed;
  top: 50%;
  left: 50%;
  color: #000;
  margin-top: -40px;
  margin-left: -200px;
}