body {
  display: flex;
  justify-content: center;
  align-items: center;

  padding: 0;
  margin: 0;
  overflow: hidden;
}
#board {
  background: black;
  width: 100vw;
  height: 100vh;
  left: 0px;
  top: 0px;
}

.ghost {
  width: 50px;
  height: 50px;
  z-index: 100;
  position: absolute;
}