/* menu */
nav h4 {
  background-color: firebrick;
  color: white;
  margin: 0.2em auto 0.1em;
  cursor: pointer;
}
nav a {
  display: inline-block;
  text-decoration: none;
  background-color: white;
  color: firebrick;
  border: 1px solid firebrick;
  border-radius: 0.2em;
  padding: 0.1em 0.2em;
  margin: 0.1em 0.05em;
}
nav a:hover {
  background-color: firebrick;
  color: white;
}
#mynav0 {
  display:none;
}
#myNav h2 {
  color: white;
  background-color: rgb(90, 90, 90);
  cursor: pointer;
}
.grplnkD, .grplnkM { 
  display: none; 
}
@media screen and (orientation: landscape) {
  /*schermo girato*/
  #mynav0 {
    display: block;
  }
  #mynavb {
    display: none;    
  }
}