div.cat1 {
  background-image: url(img/cats/acko.png);
}

div.cat2 {
  background-image: url(img/cats/becko.png);
}

div.cat3, div.cat4, div.cat5, div.cat6, div.cat7, div.cat8, div.cat9, div.cat10 {
  background-image: url(img/cats/mladez.png);
}

div.cat11 {
  background-image: url(img/cats/fanklub.png);
}

div.cat12 {
  background-image: url(img/cats/zeny.png);
}