nav{background-color:#036;padding:1em}nav ul{justify-content:center;margin:0;padding:0;list-style-type:none;display:flex}nav ul li{margin:0 .9375em}nav ul li a{color:#fff;font-weight:700;text-decoration:none;transition:color .3s;position:relative}nav ul li a:hover{color:#68c0c0}nav ul li a:after{content:"";background:#68c0c0;width:0%;height:.125em;margin-top:.3125em;transition:width .3s;display:block;position:absolute}nav ul li a:hover:after{width:100%}
body{background-color:#f4f4f4;margin:0;padding:0;font-family:Arial,sans-serif}