/* first nav top in header
----------------------------------------------------------*/
li.wp-block-pages-list__item.wp-block-navigation-item.open-on-hover-click:after {
    content: '';
    position: absolute;
    width: 1px;
    height: 8px;
    background-color: #fff;
    left: -12px;
}

/* second nav(with child) under devider line in header
----------------------------------------------------------*/
.wp-block-navigation .wp-block-navigation-item::after
/* block-navigation-item.has-child.open-on-hover-click.wp-block-navigation-submenu:after */ {
    content: '';
    position: absolute;
    width: 1px;
    height: 8px;
    background-color: #fff;
    left: -12px;
}

.wp-block-navigation .wp-block-navigation-submenu li:after {
    display: none;
    position: unset;
    width: unset;
}