div.spacer-bee, div.spacer-butterfly {
  margin: 10px auto 10px auto;
  background-position: center center;
  background-repeat: no-repeat;
  height: 48px;
}

div.spacer-bee {
  background-image: url(/games/horticulture/images/bee.png);
}

div.spacer-butterfly {
  background-image: url(/games/horticulture/images/butterfly.png);
}