body{margin:0;font-family:Helvetica;}
.nav{position:sticky;top:0;background:#fff;border-bottom:1px solid #eee;}
.nav-inner{display:flex;justify-content:space-between;padding:16px 32px;}
.nav-links a{margin:0 10px;text-decoration:none;color:#111;}
.nav-links a.active{border-bottom:2px solid black;}