li[class^="first-of-group"]:before {
  display: block;
  height: 50px;
  line-height: 50px;
  padding: 0 var(--space-md);
  color: var(--cd-color-4);
  background-color: #aac157;
  font-size: var(--text-m);
}

.first-of-group-alberghi:before {
  content: "Alberghi";
}
.first-of-group-voli:before {
  content: "Trasporti";
}
.first-of-group-vacanze:before {
  content: "Vacanze";
}