.game-character {
  position: absolute;
  bottom: 10%;
  left: 10%;
  width: 15%;
  z-index: 1; /* Change this value to a lower number */
}

.game-obstacle {
  position: absolute;
  bottom: 10%;
  right: 10%;
  width: 15%;
  z-index: 1; /* Change this value to a lower number */
}