html, body {
  margin:0;
  padding: 0;
}
canvas {
  display: block;
  -webkit-user-select: none;
  -moz-user-select: none;
  user-select: none;
}
body {
  font-family: sans-serif;
}
.controls {
  position: absolute;
  top : 0;
  right: 0;
  padding: 0.75em 1em;
  background-color: rgba(0,0,0,0.75);
  color: white;
  z-index:10;
}