Offset option in Page scroll to id plugin. http://sridharkatakam.com/smooth-scrolling-page-sections-using-page-scroll-id/

gistfile1.js

$.localScroll({
	duration: 900
});

style.css

.menu-item a.mPS2id-highlight {
    background-color: #282828;
    border-color: #D7C603;
    color: #D7C603;
}

a:focus {
	outline: none;
}