.fenyes img:hover {
  -webkit-transition: all 0.50s;
  transition: all 0.50s;
  &:hover {
      filter: brightness(90%);
      -webkit-filter: brightness(90%);
      -moz-filter: brightness(90%);
      -o-filter: brightness(90%);
      -ms-filter: brightness(90%);
      -webkit-transition: all 0.50s;
      transition: all 0.50s;
  }
}