#menu_deroulant {
  display: none;
  opacity: 0;
  transform: translateY(-20px);
  transition: all 0.6s ease;
}

#menu_deroulant.show {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

/* Animation sur les éléments du menu */
#menu_deroulant > div > div {
  opacity: 0;
  transform: translateY(-10px);
  transition: all 0.5s ease;
}

#menu_deroulant.show > div > div {
  opacity: 1;
  transform: translateY(0);
}