.single .header_color .main_menu ul:first-child>li.current-menu-item>a:hover .avia-menu-fx, .archive .header_color .main_menu ul:first-child>li.current-menu-item>a:hover .avia-menu-fx {
display: block;
}

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Highlight Menu:

.current_page_item a > .avia-menu-text {color:#ffffff!important;}

.current_page_item a {
background:#a6ce39!important;
}