#menu-item-415736:last-of-type a { 
  background: transparent url(/obrazek/3/eng-jpg/) no-repeat center; 
  background-size:contain;
  width: 50px;
  height:20px;
  font-size: 0;
  line-height: 20px;
  opacity: 0.6;
}
#menu-item-415736:last-of-type a:hover { 
  background: transparent url(/obrazek/3/eng-jpg/) no-repeat center;
  background-size:contain;
  opacity: 1;
}