Reply To: Hide nav & top menu, logo until scroll

[Tom]

Try this CSS:

.secondary-navigation.hasScrolled {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 9999;
}

.site-header.hasScrolled {
    position: fixed;
    top: 40px;
    width: 100%;
    z-index: 9999;
}