.ressources-gallerie{
   margin-top: 40px;
}
.grid-ressources li:nth-of-type(12n-2),
.grid-ressources li:nth-of-type(12n-4),
.grid-ressources li:nth-of-type(12n-9),
.grid-ressources li:nth-of-type(12n-11){
  grid-row: span 2;
}

@media screen and (max-width: 64em) and (min-width: 48em) {
   .grid-ressources li{
     grid-row: span 1 !important;
   }
   .grid-ressources li:nth-of-type(9n-3),
   .grid-ressources li:nth-of-type(9n-6),
   .grid-ressources li:nth-of-type(9n-8){
     grid-row: span 2!important;
   }
}
@media screen and (max-width: 48em) {
   .grid-ressources li{
     grid-row: span 1 !important;
   }
   .grid-ressources li:nth-of-type(6n-1),
   .grid-ressources li:nth-of-type(6n-5){
     grid-row: span 2!important;
   }
}