* {
  box-sizing: border-box;
}

html, canvas {
  background-color: #000;
}

body {
  padding:0;
  margin:0;
  border:0;
  width:100%;
  height:100%;
  overflow:hidden;
  touch-action: none;
}

canvas.fullScreen {
  position:fixed;
  left:0;
  top:0;
  width:100%;
  height:100%;
}