Color of Active Menu/Navigation Item

The color of the active menu/navigation item on this website should be orange, not white. I’m working on the Genesis platform, using the Studiopress Manhattan theme. Below is a snippet of my code (full stylesheet is https://grottomarketing.com/aggies/wp-content/themes/manhattan/style.css). I would appreciate any help

#header ul.menu li a, #header ul.menu li a:visited {
color: #FFFFFF;
display: block;
font-family: Helvetica, Arial;
font-size: 14px;
font-weight: normal;
margin: 0;
padding: 0px 10px 0px 12px;
border-right: 1px solid #ffffff;
text-decoration: none;
text-transform: none;
position: relative;
}

#header ul.menu li.noline a {
background: none;
}

#header ul.nav li a:hover, #header ul.nav li a:active, #header ul.nav .current_page_item a, #header ul.nav .current-cat a, #header ul.nav .current-menu-item a, #header ul.menu li a:hover, #header ul.menu li a:active, #header ul.menu .current_page_item a, #header ul.menu .current-cat a, #header ul.menu .current-menu-item a {
color: #F9B233;
}