.thumb {
  height:40px;
  width:100px;
  float:left;
  background-position: 0px -10px;
  background-repeat: no-repeat;
}

.thumb_category {
  height:40px;
  width:100px;
  float:left;
  background-position: 15px -20px;
  background-repeat: no-repeat;
}