.site-header{position:fixed;top:0;left:0;background:rgba(14,21,22,.9);backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);box-shadow:0 8px 30px rgba(0,0,0,.12);transition:background .25s,box-shadow .25s}html{scroll-padding-top:112px}section[id]{scroll-margin-top:112px}@media(max-width:900px){.site-header nav{position:fixed;top:82px}.site-header nav.open{box-shadow:0 18px 35px rgba(0,0,0,.22)}}