html, body {
  margin: 0;
  padding: 0;
  text-align: centered;
}
canvas {
  display: block;
  margin: 0 auto;
}

.botoneraInferior {
	position: fixed;
  bottom: 0px;
  left: 0px;
  padding: 4px;
  margin: 10px;
  display: inline-block;
}