(function() {
                        var header = document.querySelector("#bb-header");
                        var headerPaddings = 32;
                        
                        if(header) {
                            document.addEventListener('scroll', function() {
                                if (header.classList.contains('scrolled')) {
                                    if(window.scrollY < 100 - headerPaddings) {
                                        header.classList.remove("scrolled");
                                    } 
                                } else {
                                    if(window.scrollY > 100) {
                                        header.classList.add("scrolled");
                                    } 
                                }
                            }, false);
                        }
                    })();