.main-header{position:fixed;top:0;left:0;width:100%;z-index:1000;background-color:transparent;color:white;padding:1.5rem 0;transition:background-color .3s ease-in-out,color .3s ease-in-out,box-shadow .3s ease-in-out}.main-header.is-scrolled{background-color:white;color:black;box-shadow:0 2px 4px rgba(0,0,0,.05)}