header.main-header .rb-nav ul .menu-item:after {

  content: '';
  position: absolute;
  width: 100%;
  height: 5px;
  bottom: -5px;
  left: 0;
  opacity: 0;
  transition: 300ms;
  z-index: 1;


}

header.main-header .rb-nav ul .menu-item:hover:after {

  opacity: 1;

}

header.main-header .rb-nav ul .menu-item ul.sub-menu li.menu-item a .rb-menu-button {

  background-color: transparent;

}

header.main-header .rb-nav ul .menu-item ul.sub-menu {

  transition: 300ms;

}