@media (max-width: 768px) {
  #main-menu nav.navbar .nav {}
}
@media (max-width: 992px) and (min-width: 768px) {
	#main-menu nav.navbar .nav {}
}
@media (max-width: 1200px) and (min-width: 992px) {

}
@media (min-width:1200px) {

}