body {
  margin: 0;
  background-color: gray;
  background-image: url('images/checker.png');
  overflow: none;
}

#canvas {
  display: contents; 
}

svg {
  position: fixed;
  left: 0;
  width: 100vw;
  top: 0;
  height: 100vh;
}

#win {
  position: fixed;
  bottom: -100px;
  right: -100px;
  width: 100px;
  height: 100px;
  transition: bottom 200ms ease, right 200ms ease;
}

#win.visible {
  bottom: 5px;
  right: 5px;
}