.game-container{
  width: 500px;
  height: 730px;
  position: absolute;
  left: 100px;
}

.borderLeft{
  width: 60px;
  height: 790px;
  position: absolute;
  background-color: white;
  z-index: +2;
}

.borderRight{
  width: 60px;
  height: 790px;
  position: absolute;
  background-color: white;
  z-index: +2;
  left: 580px;
}

.borderTop{
  width: 660px;
  height: 50px;
  position: absolute;
  background-color: white;
  z-index: +2;
  top: -50px;
}

.sky{
  background-color: rgb(121, 178, 253);
  width: 500px;
  height: 580px;
  position:absolute;
}

.ground{
  background-color: rgb(170, 110, 83);
  width: 500px;
  height: 150px;
  position:absolute;
  top: 580px;
  z-index: +1;
}

.bird{
  background-image: url(flappy-bird.png);
  position: absolute;
  width: 60px;
  height: 45px;
}

.obstacle{
  background-image: url(flappybird-pipe.png);
  width: 60px;
  height: 300px;
  position:absolute;
}

.topObstacle{
  background-image: url(flappybird-pipe.png);
  transform: rotate(180deg);
  width: 60px;
  height: 300px;
  position:absolute;
}