body {
  background-color: #aca;
  text-align: center;
  color: #335;
}

div {
  padding: 0px;
  margin: 0px;
}

span {
  cursor: pointer;
  display: inline-block;
  padding: 0px;
  margin: 0px;
}

#game.level-1 div {
  height: 50px;
}

#game.level-1 span {
  width: 50px;
  height: 50px;
}

#game.level-2 div {
  height: 30px;
}

#game.level-2 span {
  width: 30px;
  height: 30px;
}

#game.level-3 div {
  height: 20px;
}

#game.level-3 span {
  width: 20px;
  height: 20px;
}

#game.level-4 div {
  height: 10px;
}

#game.level-4 span {
  width: 10px;
  height: 10px;
}

#game.level-5 div {
  height: 4px;
}

#game.level-5 span {
  width: 4px;
  height: 4px;
}

#game.play span {
  background-color: #aca;
}

#game.play span.wall {
  background-color: #933;
}

#game.play span.end {
  background-color: gold;
}

#game.restart span {
  background-color: #aca;
}

#game.restart span.start {
  background-color: #493;
}

span:hover {
  background-color: #059;
}