#adminmenu .toplevel_page_adghost .wp-menu-image img {
    width: 20px;
    height: 20px;
    padding: 7px 0 0;
    opacity: 0.6;
}

#adminmenu .toplevel_page_adghost:hover .wp-menu-image img,
#adminmenu .toplevel_page_adghost.current .wp-menu-image img,
#adminmenu .toplevel_page_adghost.wp-has-current-submenu .wp-menu-image img {
    opacity: 1;
}