.scroll-down .peek-a-boo{transform:translate3d(0,-100%,0)}.scroll-up .peek-a-boo{filter:drop-shadow(0 -10px 20px rgb(170,170,170))}.menu-is-open{overflow:hidden}.menu-is-open .peek-a-boo{filter:none}.header{position:fixed;top:0;left:0;right:0;z-index:1000;background-color:#fff;box-shadow:0 0 10px rgba(0,0,0,.1);transition:transform .3s}