Anchor link with fixed header scroll with padding

anchorScrollTop.js

// For FAQ page nav scrolling
function anchorScrollTo() {
    $('.anchor li a').on('click', function(e){
        e.preventDefault();     
        var scrollTo = $($(this).attr('href'));
        var headerHeight = $('.page_header').height();    
        console.log(scrollTo, headerHeight);
        $('html,body').animate({
            scrollTop: scrollTo.offset().top - headerHeight},
        'slow');
    });
};