.gopher {
  background: url('./gopher.png') center center no-repeat;
  background-size: 200px 200px;
}
.dead {
  background: url('./dead_gopher.png') center center no-repeat;
  background-size: 200px 200px;
}
.bomb {
  background: url('./bomb.png') center center no-repeat;
  background-size: 200px 200px;
}
.boom {
  background: url('./explode.png') center center no-repeat;
  background-size: 200px 200px;
}
.hidden {
  bottom: -200px;
}
.hole {
  width: 200px; height: 150px; position: absolute; bottom: 0;
  background: url('./mole-hole.png') center center no-repeat;
  background-size: 200px 150px;
}