(function() {
                    let nav = document.querySelector(".bb-desktop-nav");
                    if (!nav) {
                        nav = document.querySelector(".nav-menu nav");
                    }
                    const currSlug = location.pathname;
                    const currPageAnchor = nav.querySelector('a[href="'+currSlug+'"]');
                    const header = document.querySelector("#bb-header");

                    let lastAnchor = currPageAnchor;
					
                    document.addEventListener('scroll', function(){
                        if (!window.isScrollToSection) {
                            let headerOffsetHeight = 0;
                            
                                headerOffsetHeight = header.offsetHeight;
                            
                            let matchFound = false;
                            document.querySelectorAll("#bb-mc .bb-section").forEach((section, index) => {
                                let anchor;
                                let top = section.offsetTop;
                                let bottom = section.offsetTop + section.offsetHeight;

                                if (index > 0) {
                                    top = section.offsetTop - headerOffsetHeight - section.offsetHeight*0.3;
                                    bottom = section.offsetTop + section.offsetHeight*0.7;
                                }

                                if (window.scrollY >= top && window.scrollY <= bottom) {
                                    let sectionID = section.id.replace("bb-section-", "");
                                    anchor = nav.querySelector('a[data-anchor="'+sectionID+'"]');
                                    matchFound = true;
                                    if (!anchor) {
                                        anchor = lastAnchor;
                                    }
                                    else {
                                        lastAnchor = anchor;
                                    }
                                }
                                else if (!matchFound) {
                                    anchor = lastAnchor;
                                }

                                if (anchor) {
                                    nav.querySelector("a.active").classList.remove("active");
                                    anchor.classList.add("active");
                                }
                            });
                        }
                    });
                })();