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1- You can add this Custom CSS segment on Theme Options > Custom CSS & Script > Custom CSS to change the color of current menu item:
@media screen and (min-width: 992px){
header.yolo-main-header .yolo-header-wrapper .yolo-main-menu li.current-menu-item > a {
color: #0c0c0c !important;
}
}
2- To change menu to white color, you can use this Custom CSS:
header.header-4.yolo-main-header .yolo-header-nav-wrapper .container .yolo-header-wrapper {
background-color: #ffffff !important;
}
Please check, then feedback us.
Best Regards,
YoloTheme