body {
  background-color: #111111;
  overflow: hidden;
  padding: 0;
  margin: 0;
  touch-action: none; 
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
  position: relative;
}

#video {
  display: none;
  background-color: black;
  border: 10px solid red;
  position: absolute; 
  width: 40%;
  height: 40%;
  top: 15%;
  left: 30%;
}

#matter > canvas {
  background-color: #000000;
  display: block;
  margin: 0 auto;
  outline-offset: -10px;
}