To change the hover color of navigation menu
Go to the Appearance -> Theme Options -> Basic Settings -> Custom CSS
add below css code and change the color code
.sitenav ul li.current_page_item a { color: #000000 !important; }
.sitenav ul li a:hover { color: #000000 !important; }
.sitenav ul li.current-menu-parent a.parent { color: #000000; }