Template:Main menu/styles.css

.main-menu-home, .main-menu-scientific-community, .main-menu-book-index, .main-menu-our-network, .main-menu-contact {
	display: inline-block;
}
.main-menu-child {
	display: none ;
}

.main-menu-home:hover > *, .main-menu-our-network:hover > *  {
	display: block;
}