#gameContainer {
  width: 600px;
  height: 400px;
  background: black;
  position: relative;
  margin: 20px auto;
}

.paddle {
  width: 15px;
  height: 70px;
  background: white;
  position: absolute;
}

#paddleA {
  left: 0;
  top: 165px;
}

#paddleB {
  right: 0;
  top: 165px;
}

#ball {
  width: 15px;
  height: 15px;
  background: white;
  position: absolute;
  top: 50%;
  left: 50%;
  border-radius: 50%;
}