a{text-decoration:none;border-bottom:1px solid}a:hover{background:yellow;border-bottom-width:3px}footer{text-align:center;font-size:0.625rem}nav{position:relative;width:100%;border-bottom:1px solid}nav ul{display:flex;flex-wrap:wrap;padding:0}nav ul li{padding-left:2rem;list-style-type:none}article{margin-left:2rem;margin-right:2rem}@media only screen and (min-width: 55rem){nav{position:fixed;width:7rem;line-height:2;border-bottom:none}article{margin-left:11rem;margin-right:4rem;max-width:40rem}}